Error setting RadContextMenu.ItemContainerStyle in SL4

3 posts, 1 answers
  1. Brandon Strevell
    Brandon Strevell avatar
    6 posts
    Member since:
    Aug 2009

    Posted 25 Mar 2010 Link to this post

    I'm getting a run-time error "Set property '' threw an exception" when I set the ItemContainerStyle of a RadContextMenu using the Silverlight 4 RC 2010.1 309.  Am I doing something wrong?

            <local:DataItemCollection x:Key="ItemsSource"
                <local:DataItem Text="Item 1"
                    <local:DataItem Text="Item 1.1" /> 
                    <local:DataItem Text="Item 1.2" /> 
                    <local:DataItem Text="Item 1.3" /> 
                <local:DataItem Text="Item 2"
                    <local:DataItem Text="Item 2.1" /> 
                    <local:DataItem Text="Item 2.2" /> 
                    <local:DataItem Text="Item 2.3" /> 
                <local:DataItem Text="Item 3"
                    <local:DataItem Text="Item 3.1" /> 
                    <local:DataItem Text="Item 3.2" /> 
                    <local:DataItem Text="Item 3.3" /> 
            <telerikNavigation:RadContextMenu ItemsSource="{Binding Source={StaticResource ItemsSource}}" > 
                    <Style TargetType="telerikNavigation:RadMenuItem"
                        <Setter Property="Header" Value="{Binding Text}"/> 
                        <Setter Property="ItemsSource" Value="{Binding Children}"/> 

    System.Windows.Markup.XamlParseException occurred
      Message=Set property '' threw an exception. [Line: 35 Position: 53]
           at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
      InnerException: System.NotSupportedException
           Message=Cannot set read-only property ''.
                at MS.Internal.XamlMemberInfo.SetValue(Object target, Object value)
                at MS.Internal.XamlManagedRuntimeRPInvokes.SetValue(XamlTypeToken inType, XamlQualifiedObject& inObj, XamlPropertyToken inProperty, XamlQualifiedObject& inValue)
  2. Answer
    Hristo avatar
    832 posts

    Posted 26 Mar 2010 Link to this post

    Hello Brandon Strevell,

    Silverlight 4 doesn't support Bindings in Style setter.
    <Setter Property="Header" Value="{Binding Text}"/>

    With the RC release the parser now throws exception (in SL 3 it was ignored).
    We have workaround for this - ContainerBindingCollection where you specify Binding for each property of the container (in this case RadMenuItem) that have to be bound.
    You can see an example with source code here:

    Let us know if you need more information.

    Kind regards,
    the Telerik team

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  3. Brandon Strevell
    Brandon Strevell avatar
    6 posts
    Member since:
    Aug 2009

    Posted 26 Mar 2010 Link to this post

    Thank you, that makes perfect sense.
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