Ctechnology24 0 Light Poster

How can I enter a code for my ribbonsplitbutton's menu items? because the GUI of ribbonsplitbutton is not clickable so how can I enter a code for the menuitem inside it if it is not visible in the design time here is my xaml code

<Window x:Class="Window1"
    xmlns:my="http://schemas.microsoft.com/winfx/2006/xaml/presentation/ribbon" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300" WindowState="Maximized" Name="Window1">
    <Grid>
        <my:Ribbon Name="Ribbon">
            <my:RibbonTab Header="Account" KeyTip="A">
                <my:RibbonGroup Name="GroupCurrent" Header="Current">
                    <my:RibbonSplitButton Name="SplitAcc" Label="Action" KeyTip="CA" LargeImageSource="/WpfApplicationRibbon;component/Images/user_male_white_blue_black.png">
                        <my:RibbonMenuItem Name="btnView" Header="View Account" KeyTip="VA" />
                        <my:RibbonMenuItem Name="btnLogout" Header="Log out" KeyTip="LO" />
                    </my:RibbonSplitButton>
                    <my:RibbonButton Name="btnSysLock" Label="System Lock" LargeImageSource="/WpfApplicationRibbon;component/Images/lockred.jpg" />
                </my:RibbonGroup>
            </my:RibbonTab>
        </my:Ribbon>

    </Grid>
</Window>

as you can see I have two RibbonMenuItem inside my RibbonsplitButton,, How can I Enter a code for those controls?