So I am currently working with custom silverlight extensions for a SAP application.

The extension kicks off a an async WCF request and waits for the response.

During which time I try the following:

                    waitWindow = new RadWindow();
                    waitWindow.WindowStartupLocation = Telerik.Windows.Controls.WindowStartupLocation.CenterScreen;
                    waitWindow.BorderThickness = new Thickness(0);
                    waitWindow.Content = new View.WaitWindowTest();

Where View.WaitWindowTest is a UserControl with the standard C# constructor behind it:

    mc:Ignorable="d" d:DesignWidth="300" d:DesignHeight="50">

    <Grid x:Name="LayoutRoot">

            <Style x:Key="BorderlessWindowStyle" TargetType="telerikNavigation:RadWindow">
                <Setter Property="Template">
                        <ControlTemplate TargetType="telerikNavigation:RadWindow">
                            <Border BorderBrush="{TemplateBinding BorderBrush}"
                                    BorderThickness="{TemplateBinding BorderThickness}"
                                    Background="{TemplateBinding Background}">
                                <ContentPresenter Margin="{TemplateBinding Padding}"
                                        HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                        VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
        <telerikNavigation:RadWindow x:Name="Window1" Style="{StaticResource BorderlessWindowStyle}" Width="300" Height="50" Padding="50,15,0,0" >
            <TextBlock FontSize="15">Processing, please wait...</TextBlock>

However when I run the above code I get the following error:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E)
Timestamp: Tue, 28 Oct 2014 12:47:13 UTC

Message: Unhandled Error in Silverlight 3 Application: RadWindow control needs to be displayed using its Show or ShowDialog method and shouldn't be added to the layout.
Line: 1
Char: 1
Code: 0
URI: http://localhost/censored/Silverlight.js

Message: Unhandled Error in Silverlight Application 
Code: 4004    
Category: ManagedRuntimeError       
Message: System.InvalidOperationException: RadWindow control needs to be displayed using its Show or ShowDialog method and shouldn't be added to the layout.
   at Telerik.Windows.Controls.RadWindow.OnApplyTemplate()
   at System.Windows.FrameworkElement.OnApplyTemplate(IntPtr nativeTarget)     

Line: 62
Char: 13
Code: 0
URI: http://localhost/sensored/default.aspx 

Does anybody know what I am doing wrong? Fairly new to silverlight and MVVM and the code was based off existing code I had.

It was an attempt based off the code provided in the following link:

Can you point me in the direction of some form of guidance in how to do that Prit? Not done before in terms of modifying a RadWindow template

If you manually add <RadWindow> to your usercontrol XAML and define it's properties there, technically the Show should work then. It might need a prefix, but not sure what you are using for Telerik components.

Ok shall give it a go, seem to have found another way to do it that has the border but no close button etc.

For the moment I am settling for that due to deadlines and I need to finalise some functionality first. I will revisit this if I get time and let you know the outcome.

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