I seem to get this error every-time i create a web-browser with tabs.

Overload resolution failed because no accessible 'Int' accepts this number of arguments.

Here is my code:

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class Form6
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        Try
            If disposing AndAlso components IsNot Nothing Then
                components.Dispose()
            End If
        Finally
            MyBase.Dispose(disposing)
        End Try
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Dim resources As System.ComponentModel.ComponentResourceManager = New System.ComponentModel.ComponentResourceManager(GetType(Form6))
        Me.RibbonControl1 = New DevComponents.DotNetBar.RibbonControl()
        Me.RibbonPanel1 = New DevComponents.DotNetBar.RibbonPanel()
        Me.RibbonBar1 = New DevComponents.DotNetBar.RibbonBar()
        Me.TextBox1 = New System.Windows.Forms.TextBox()
        Me.Back = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem15 = New DevComponents.DotNetBar.ButtonItem()
        Me.LabelItem1 = New DevComponents.DotNetBar.LabelItem()
        Me.ButtonItem14 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem16 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem19 = New DevComponents.DotNetBar.ButtonItem()
        Me.LabelItem2 = New DevComponents.DotNetBar.LabelItem()
        Me.ButtonItem20 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem17 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem18 = New DevComponents.DotNetBar.ButtonItem()
        Me.RibbonPanel2 = New DevComponents.DotNetBar.RibbonPanel()
        Me.RibbonTabItem1 = New DevComponents.DotNetBar.RibbonTabItem()
        Me.RibbonTabItem2 = New DevComponents.DotNetBar.RibbonTabItem()
        Me.Office2007StartButton1 = New DevComponents.DotNetBar.Office2007StartButton()
        Me.ItemContainer1 = New DevComponents.DotNetBar.ItemContainer()
        Me.ItemContainer2 = New DevComponents.DotNetBar.ItemContainer()
        Me.ItemContainer3 = New DevComponents.DotNetBar.ItemContainer()
        Me.ButtonItem2 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem3 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem4 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem5 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem6 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem7 = New DevComponents.DotNetBar.ButtonItem()
        Me.GalleryContainer1 = New DevComponents.DotNetBar.GalleryContainer()
        Me.labelItem8 = New DevComponents.DotNetBar.LabelItem()
        Me.ButtonItem8 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem9 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem10 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem11 = New DevComponents.DotNetBar.ButtonItem()
        Me.ItemContainer4 = New DevComponents.DotNetBar.ItemContainer()
        Me.ButtonItem12 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem13 = New DevComponents.DotNetBar.ButtonItem()
        Me.ButtonItem1 = New DevComponents.DotNetBar.ButtonItem()
        Me.QatCustomizeItem1 = New DevComponents.DotNetBar.QatCustomizeItem()
        Me.TabControl1 = New System.Windows.Forms.TabControl()
        Me.RibbonControl1.SuspendLayout()
        Me.RibbonPanel1.SuspendLayout()
        Me.RibbonBar1.SuspendLayout()
        Me.SuspendLayout()
        '
        'RibbonControl1
        '
        Me.RibbonControl1.Controls.Add(Me.RibbonPanel1)
        Me.RibbonControl1.Controls.Add(Me.RibbonPanel2)
        Me.RibbonControl1.Dock = System.Windows.Forms.DockStyle.Top
        Me.RibbonControl1.Items.AddRange(New DevComponents.DotNetBar.BaseItem() {Me.RibbonTabItem1, Me.RibbonTabItem2})
        Me.RibbonControl1.KeyTipsFont = New System.Drawing.Font("Tahoma", 7.0!)
        Me.RibbonControl1.Location = New System.Drawing.Point(0, 0)
        Me.RibbonControl1.Name = "RibbonControl1"
        Me.RibbonControl1.Padding = New System.Windows.Forms.Padding(0, 0, 0, 2)
        Me.RibbonControl1.QuickToolbarItems.AddRange(New DevComponents.DotNetBar.BaseItem() {Me.Office2007StartButton1, Me.ButtonItem1, Me.QatCustomizeItem1})
        Me.RibbonControl1.Size = New System.Drawing.Size(1195, 103)
        Me.RibbonControl1.Style = DevComponents.DotNetBar.eDotNetBarStyle.Office2007
        Me.RibbonControl1.TabGroupHeight = 14
        Me.RibbonControl1.TabIndex = 0
        Me.RibbonControl1.Text = "RibbonControl1"
        '
        'RibbonPanel1
        '
        Me.RibbonPanel1.ColorSchemeStyle = DevComponents.DotNetBar.eDotNetBarStyle.Office2007
        Me.RibbonPanel1.Controls.Add(Me.RibbonBar1)
        Me.RibbonPanel1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.RibbonPanel1.Location = New System.Drawing.Point(0, 25)
        Me.RibbonPanel1.Name = "RibbonPanel1"
        Me.RibbonPanel1.Padding = New System.Windows.Forms.Padding(3, 0, 3, 3)
        Me.RibbonPanel1.Size = New System.Drawing.Size(1195, 76)
        Me.RibbonPanel1.TabIndex = 1
        '
        'RibbonBar1
        '
        Me.RibbonBar1.AutoOverflowEnabled = True
        Me.RibbonBar1.ContainerControlProcessDialogKey = True
        Me.RibbonBar1.Controls.Add(Me.TextBox1)
        Me.RibbonBar1.Dock = System.Windows.Forms.DockStyle.Top
        Me.RibbonBar1.Items.AddRange(New DevComponents.DotNetBar.BaseItem() {Me.Back, Me.ButtonItem15, Me.LabelItem1, Me.ButtonItem14, Me.ButtonItem16, Me.ButtonItem19, Me.LabelItem2, Me.ButtonItem20, Me.ButtonItem17, Me.ButtonItem18})
        Me.RibbonBar1.Location = New System.Drawing.Point(3, 0)
        Me.RibbonBar1.Name = "RibbonBar1"
        Me.RibbonBar1.Size = New System.Drawing.Size(1189, 73)
        Me.RibbonBar1.Style = DevComponents.DotNetBar.eDotNetBarStyle.Office2007
        Me.RibbonBar1.TabIndex = 0
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(184, 18)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(850, 20)
        Me.TextBox1.TabIndex = 0
        '
        'Back
        '
        Me.Back.Image = CType(resources.GetObject("Back.Image"), System.Drawing.Image)
        Me.Back.Name = "Back"
        Me.Back.SubItemsExpandWidth = 14
        Me.Back.Text = "ButtonItem14"
        '
        'ButtonItem15
        '
        Me.ButtonItem15.Image = CType(resources.GetObject("ButtonItem15.Image"), System.Drawing.Image)
        Me.ButtonItem15.Name = "ButtonItem15"
        Me.ButtonItem15.SubItemsExpandWidth = 14
        Me.ButtonItem15.Text = "ButtonItem15"
        '
        'LabelItem1
        '
        Me.LabelItem1.Name = "LabelItem1"
        Me.LabelItem1.Text = " "
        '
        'ButtonItem14
        '
        Me.ButtonItem14.Image = CType(resources.GetObject("ButtonItem14.Image"), System.Drawing.Image)
        Me.ButtonItem14.Name = "ButtonItem14"
        Me.ButtonItem14.SubItemsExpandWidth = 14
        Me.ButtonItem14.Text = "ButtonItem14"
        '
        'ButtonItem16
        '
        Me.ButtonItem16.Image = CType(resources.GetObject("ButtonItem16.Image"), System.Drawing.Image)
        Me.ButtonItem16.Name = "ButtonItem16"
        Me.ButtonItem16.SubItemsExpandWidth = 14
        Me.ButtonItem16.Text = "ButtonItem16"
        '
        'ButtonItem19
        '
        Me.ButtonItem19.Image = CType(resources.GetObject("ButtonItem19.Image"), System.Drawing.Image)
        Me.ButtonItem19.Name = "ButtonItem19"
        Me.ButtonItem19.SubItemsExpandWidth = 14
        Me.ButtonItem19.Text = "ButtonItem19"
        '
        'LabelItem2
        '
        Me.LabelItem2.Name = "LabelItem2"
        Me.LabelItem2.Text = resources.GetString("LabelItem2.Text")
        '
        'ButtonItem20
        '
        Me.ButtonItem20.Image = CType(resources.GetObject("ButtonItem20.Image"), System.Drawing.Image)
        Me.ButtonItem20.Name = "ButtonItem20"
        Me.ButtonItem20.SubItemsExpandWidth = 14
        Me.ButtonItem20.Text = "ButtonItem20"
        '
        'ButtonItem17
        '
        Me.ButtonItem17.Image = CType(resources.GetObject("ButtonItem17.Image"), System.Drawing.Image)
        Me.ButtonItem17.Name = "ButtonItem17"
        Me.ButtonItem17.SubItemsExpandWidth = 14
        Me.ButtonItem17.Text = "ButtonItem17"
        '
        'ButtonItem18
        '
        Me.ButtonItem18.Image = CType(resources.GetObject("ButtonItem18.Image"), System.Drawing.Image)
        Me.ButtonItem18.Name = "ButtonItem18"
        Me.ButtonItem18.SubItemsExpandWidth = 14
        Me.ButtonItem18.Text = "ButtonItem18"
        '
        'RibbonPanel2
        '
        Me.RibbonPanel2.ColorSchemeStyle = DevComponents.DotNetBar.eDotNetBarStyle.Office2007
        Me.RibbonPanel2.Dock = System.Windows.Forms.DockStyle.Fill
        Me.RibbonPanel2.Location = New System.Drawing.Point(0, 0)
        Me.RibbonPanel2.Name = "RibbonPanel2"
        Me.RibbonPanel2.Padding = New System.Windows.Forms.Padding(3, 0, 3, 3)
        Me.RibbonPanel2.Size = New System.Drawing.Size(75, 21)
        Me.RibbonPanel2.TabIndex = 2
        '
        'RibbonTabItem1
        '
        Me.RibbonTabItem1.Checked = True
        Me.RibbonTabItem1.Name = "RibbonTabItem1"
        Me.RibbonTabItem1.Panel = Me.RibbonPanel1
        Me.RibbonTabItem1.Text = "Home"
        '
        'RibbonTabItem2
        '
        Me.RibbonTabItem2.Name = "RibbonTabItem2"
        Me.RibbonTabItem2.Panel = Me.RibbonPanel2
        Me.RibbonTabItem2.Text = "RibbonTabItem2"
        '
        'Office2007StartButton1
        '
        Me.Office2007StartButton1.AutoExpandOnClick = True
        Me.Office2007StartButton1.CanCustomize = False
        Me.Office2007StartButton1.HotTrackingStyle = DevComponents.DotNetBar.eHotTrackingStyle.Image
        Me.Office2007StartButton1.Image = CType(resources.GetObject("Office2007StartButton1.Image"), System.Drawing.Image)
        Me.Office2007StartButton1.ImagePaddingHorizontal = 2
        Me.Office2007StartButton1.ImagePaddingVertical = 2
        Me.Office2007StartButton1.Name = "Office2007StartButton1"
        Me.Office2007StartButton1.ShowSubItems = False
        Me.Office2007StartButton1.SubItems.AddRange(New DevComponents.DotNetBar.BaseItem() {Me.ItemContainer1})
        Me.Office2007StartButton1.Text = "&File"
        '
        'ItemContainer1
        '
        '
        '
        '
        Me.ItemContainer1.BackgroundStyle.Class = "RibbonFileMenuContainer"
        Me.ItemContainer1.LayoutOrientation = DevComponents.DotNetBar.eOrientation.Vertical
        Me.ItemContainer1.Name = "ItemContainer1"
        Me.ItemContainer1.SubItems.AddRange(New DevComponents.DotNetBar.BaseItem() {Me.ItemContainer2, Me.ItemContainer4})
        '
        'ItemContainer2
        '
        '
        '
        '
        Me.ItemContainer2.BackgroundStyle.Class = "RibbonFileMenuTwoColumnContainer"
        Me.ItemContainer2.ItemSpacing = 0
        Me.ItemContainer2.Name = "ItemContainer2"
        Me.ItemContainer2.SubItems.AddRange(New DevComponents.DotNetBar.BaseItem() {Me.ItemContainer3, Me.GalleryContainer1})
        '
        'ItemContainer3
        '
        '
        '
        '
        Me.ItemContainer3.BackgroundStyle.Class = "RibbonFileMenuColumnOneContainer"
        Me.ItemContainer3.LayoutOrientation = DevComponents.DotNetBar.eOrientation.Vertical
        Me.ItemContainer3.MinimumSize = New System.Drawing.Size(120, 0)
        Me.ItemContainer3.Name = "ItemContainer3"
        Me.ItemContainer3.SubItems.AddRange(New DevComponents.DotNetBar.BaseItem() {Me.ButtonItem2, Me.ButtonItem3, Me.ButtonItem4, Me.ButtonItem5, Me.ButtonItem6, Me.ButtonItem7})
        '
        'ButtonItem2
        '
        Me.ButtonItem2.ButtonStyle = DevComponents.DotNetBar.eButtonStyle.ImageAndText
        Me.ButtonItem2.Image = CType(resources.GetObject("ButtonItem2.Image"), System.Drawing.Image)
        Me.ButtonItem2.Name = "ButtonItem2"
        Me.ButtonItem2.SubItemsExpandWidth = 24
        Me.ButtonItem2.Text = "&New"
        '
        'ButtonItem3
        '
        Me.ButtonItem3.ButtonStyle = DevComponents.DotNetBar.eButtonStyle.ImageAndText
        Me.ButtonItem3.Image = CType(resources.GetObject("ButtonItem3.Image"), System.Drawing.Image)
        Me.ButtonItem3.Name = "ButtonItem3"
        Me.ButtonItem3.SubItemsExpandWidth = 24
        Me.ButtonItem3.Text = "&Open..."
        '
        'ButtonItem4
        '
        Me.ButtonItem4.ButtonStyle = DevComponents.DotNetBar.eButtonStyle.ImageAndText
        Me.ButtonItem4.Image = CType(resources.GetObject("ButtonItem4.Image"), System.Drawing.Image)
        Me.ButtonItem4.Name = "ButtonItem4"
        Me.ButtonItem4.SubItemsExpandWidth = 24
        Me.ButtonItem4.Text = "&Save..."
        '
        'ButtonItem5
        '
        Me.ButtonItem5.BeginGroup = True
        Me.ButtonItem5.ButtonStyle = DevComponents.DotNetBar.eButtonStyle.ImageAndText
        Me.ButtonItem5.Image = CType(resources.GetObject("ButtonItem5.Image"), System.Drawing.Image)
        Me.ButtonItem5.Name = "ButtonItem5"
        Me.ButtonItem5.SubItemsExpandWidth = 24
        Me.ButtonItem5.Text = "S&hare..."
        '
        'ButtonItem6
        '
        Me.ButtonItem6.ButtonStyle = DevComponents.DotNetBar.eButtonStyle.ImageAndText
        Me.ButtonItem6.Image = CType(resources.GetObject("ButtonItem6.Image"), System.Drawing.Image)
        Me.ButtonItem6.Name = "ButtonItem6"
        Me.ButtonItem6.SubItemsExpandWidth = 24
        Me.ButtonItem6.Text = "&Print..."
        '
        'ButtonItem7
        '
        Me.ButtonItem7.BeginGroup = True
        Me.ButtonItem7.ButtonStyle = DevComponents.DotNetBar.eButtonStyle.ImageAndText
        Me.ButtonItem7.Image = CType(resources.GetObject("ButtonItem7.Image"), System.Drawing.Image)
        Me.ButtonItem7.Name = "ButtonItem7"
        Me.ButtonItem7.SubItemsExpandWidth = 24
        Me.ButtonItem7.Text = "&Close"
        '
        'GalleryContainer1
        '
        '
        '
        '
        Me.GalleryContainer1.BackgroundStyle.Class = "RibbonFileMenuColumnTwoContainer"
        Me.GalleryContainer1.EnableGalleryPopup = False
        Me.GalleryContainer1.LayoutOrientation = DevComponents.DotNetBar.eOrientation.Vertical
        Me.GalleryContainer1.MinimumSize = New System.Drawing.Size(180, 240)
        Me.GalleryContainer1.MultiLine = False
        Me.GalleryContainer1.Name = "GalleryContainer1"
        Me.GalleryContainer1.PopupUsesStandardScrollbars = False
        Me.GalleryContainer1.SubItems.AddRange(New DevComponents.DotNetBar.BaseItem() {Me.labelItem8, Me.ButtonItem8, Me.ButtonItem9, Me.ButtonItem10, Me.ButtonItem11})
        '
        'labelItem8
        '
        Me.labelItem8.BorderSide = DevComponents.DotNetBar.eBorderSide.Bottom
        Me.labelItem8.BorderType = DevComponents.DotNetBar.eBorderType.Etched
        Me.labelItem8.CanCustomize = False
        Me.labelItem8.Name = "labelItem8"
        Me.labelItem8.PaddingBottom = 2
        Me.labelItem8.PaddingTop = 2
        Me.labelItem8.Stretch = True
        Me.labelItem8.Text = "Recent Documents"
        '
        'ButtonItem8
        '
        Me.ButtonItem8.Name = "ButtonItem8"
        Me.ButtonItem8.Text = "&1. Short News 5-7.rtf"
        '
        'ButtonItem9
        '
        Me.ButtonItem9.Name = "ButtonItem9"
        Me.ButtonItem9.Text = "&2. Prospect Email.rtf"
        '
        'ButtonItem10
        '
        Me.ButtonItem10.Name = "ButtonItem10"
        Me.ButtonItem10.Text = "&3. Customer Email.rtf"
        '
        'ButtonItem11
        '
        Me.ButtonItem11.Name = "ButtonItem11"
        Me.ButtonItem11.Text = "&4. example.rtf"
        '
        'ItemContainer4
        '
        '
        '
        '
        Me.ItemContainer4.BackgroundStyle.Class = "RibbonFileMenuBottomContainer"
        Me.ItemContainer4.HorizontalItemAlignment = DevComponents.DotNetBar.eHorizontalItemsAlignment.Right
        Me.ItemContainer4.Name = "ItemContainer4"
        Me.ItemContainer4.SubItems.AddRange(New DevComponents.DotNetBar.BaseItem() {Me.ButtonItem12, Me.ButtonItem13})
        '
        'ButtonItem12
        '
        Me.ButtonItem12.ButtonStyle = DevComponents.DotNetBar.eButtonStyle.ImageAndText
        Me.ButtonItem12.ColorTable = DevComponents.DotNetBar.eButtonColor.OrangeWithBackground
        Me.ButtonItem12.Image = CType(resources.GetObject("ButtonItem12.Image"), System.Drawing.Image)
        Me.ButtonItem12.Name = "ButtonItem12"
        Me.ButtonItem12.SubItemsExpandWidth = 24
        Me.ButtonItem12.Text = "Opt&ions"
        '
        'ButtonItem13
        '
        Me.ButtonItem13.ButtonStyle = DevComponents.DotNetBar.eButtonStyle.ImageAndText
        Me.ButtonItem13.ColorTable = DevComponents.DotNetBar.eButtonColor.OrangeWithBackground
        Me.ButtonItem13.Image = CType(resources.GetObject("ButtonItem13.Image"), System.Drawing.Image)
        Me.ButtonItem13.Name = "ButtonItem13"
        Me.ButtonItem13.SubItemsExpandWidth = 24
        Me.ButtonItem13.Text = "E&xit"
        '
        'ButtonItem1
        '
        Me.ButtonItem1.Name = "ButtonItem1"
        Me.ButtonItem1.Text = "ButtonItem1"
        '
        'QatCustomizeItem1
        '
        Me.QatCustomizeItem1.Name = "QatCustomizeItem1"
        '
        'TabControl1
        '
        Me.TabControl1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.TabControl1.Location = New System.Drawing.Point(0, 103)
        Me.TabControl1.Name = "TabControl1"
        Me.TabControl1.SelectedIndex = 0
        Me.TabControl1.Size = New System.Drawing.Size(1195, 328)
        Me.TabControl1.TabIndex = 1
        '
        'Form6
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(1195, 431)
        Me.Controls.Add(Me.TabControl1)
        Me.Controls.Add(Me.RibbonControl1)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow
        Me.Icon = CType(resources.GetObject("$this.Icon"), System.Drawing.Icon)
        Me.Name = "Form6"
        Me.Text = "Photon"
        Me.RibbonControl1.ResumeLayout(False)
        Me.RibbonControl1.PerformLayout()
        Me.RibbonPanel1.ResumeLayout(False)
        Me.RibbonBar1.ResumeLayout(False)
        Me.RibbonBar1.PerformLayout()
        Me.ResumeLayout(False)

    End Sub
    Friend WithEvents RibbonControl1 As DevComponents.DotNetBar.RibbonControl
    Friend WithEvents RibbonPanel1 As DevComponents.DotNetBar.RibbonPanel
    Friend WithEvents RibbonBar1 As DevComponents.DotNetBar.RibbonBar
    Friend WithEvents RibbonPanel2 As DevComponents.DotNetBar.RibbonPanel
    Friend WithEvents RibbonTabItem1 As DevComponents.DotNetBar.RibbonTabItem
    Friend WithEvents RibbonTabItem2 As DevComponents.DotNetBar.RibbonTabItem
    Friend WithEvents Office2007StartButton1 As DevComponents.DotNetBar.Office2007StartButton
    Friend WithEvents ItemContainer1 As DevComponents.DotNetBar.ItemContainer
    Friend WithEvents ItemContainer2 As DevComponents.DotNetBar.ItemContainer
    Friend WithEvents ItemContainer3 As DevComponents.DotNetBar.ItemContainer
    Friend WithEvents ButtonItem2 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem3 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem4 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem5 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem6 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem7 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents GalleryContainer1 As DevComponents.DotNetBar.GalleryContainer
    Friend WithEvents labelItem8 As DevComponents.DotNetBar.LabelItem
    Friend WithEvents ButtonItem8 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem9 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem10 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem11 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ItemContainer4 As DevComponents.DotNetBar.ItemContainer
    Friend WithEvents ButtonItem12 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem13 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem1 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents QatCustomizeItem1 As DevComponents.DotNetBar.QatCustomizeItem
    Friend WithEvents Back As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem15 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents TabControl1 As System.Windows.Forms.TabControl
    Friend WithEvents LabelItem1 As DevComponents.DotNetBar.LabelItem
    Friend WithEvents LabelItem2 As DevComponents.DotNetBar.LabelItem
    Friend WithEvents ButtonItem14 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem16 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem17 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem18 As DevComponents.DotNetBar.ButtonItem

    Private Sub Form6_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim Browser As New WebBrowser
        TabControl1.TabPages.Add("New Page")
        Browser.Name = "Web Browser"
        Browser.Dock = DockStyle.Fill
        TabControl1.SelectedTab.Controls.Add(Browser)
        Int = Int() + 1
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).GoHome()
    End Sub

    Private Sub Back_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Back.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).GoBack()
    End Sub

    Private Sub ButtonItem15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonItem15.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).GoForward()
    End Sub

    Private Sub ButtonItem14_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonItem14.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).Refresh()
    End Sub

    Private Sub ButtonItem16_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonItem16.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).Stop()
    End Sub

    Private Sub ButtonItem17_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonItem17.Click
        Dim Browser As New WebBrowser
        TabControl1.TabPages.Add("New Page")
        TabControl1.SelectTab(Int)
        Browser.Name = "Web Browser"
        Browser.Dock = DockStyle.Fill
        TabControl1.SelectedTab.Controls.Add(Browser)
        Int = Int() + 1
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).GoHome()
    End Sub

    Private Sub ButtonItem18_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonItem18.Click
        If Not TabControl1.TabPages.Count = 1 Then
            TabControl1.TabPages.RemoveAt(TabControl1.SelectedIndex)
            TabControl1.SelectTab(TabControl1.TabPages.Count - 1)
            Int = Int() - 1
        End If
    End Sub
    Friend WithEvents ButtonItem19 As DevComponents.DotNetBar.ButtonItem
    Friend WithEvents ButtonItem20 As DevComponents.DotNetBar.ButtonItem

    Private Sub ButtonItem19_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonItem19.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).GoHome()
    End Sub

    Private Sub ButtonItem20_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonItem20.Click
        CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).Navigate(TextBox1.Text)
    End Sub
End Class

Int is is not initialised.
add the following line just above the function "Form6_Load"

Private Int As Integer

and replace "Int = Int() - 1" with

Int = Int - 1
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