RadDocking issue with SL5 RC? "Value Does not fall within expected range"

[David]

I have an app that was working fine with SL5 Beta (From Mix 2011) and the currently released Telerik SL controls, but it now does not work with SL5 RC and this is blocking my development. The problem appears to be that I can't have any elements in XAML inside the RadPane.. This was not an issue before I upgraded to SL5 RC. Any ideas?

<telerik:RadDocking Name="DockingRoot">
        <telerik:RadDocking.DocumentHost >
            <telerik:RadSplitContainer>
                <telerik:RadPaneGroup Name="MainDockingPaneGroup" AllowDragReorder="True">
                    <telerik:RadPane Header="Workitems" CanUserClose="False">
                          <TextBlock TextWrapping="Wrap" Text="Try dragging windows around, pinning/unpinning etc. This is just a simple test. Please try"/>
                    </telerik:RadPane>
                </telerik:RadPaneGroup>
            </telerik:RadSplitContainer>
        </telerik:RadDocking.DocumentHost>

[Boyan]

Hello David,

We are currently testing our controls against the Silverlight 5 RC. There are some issues that we found and some of them are major like the one in the thread you send. You can't set content to lots of our controls like RadPane, RadComboBox, RadTabControl etc.. We have reported this issue to Microsoft as they claim that SL4 applications will be fully compatible with SL5, so this exact problem will be fixed at their side. I can assure you that we are tightly following Microsoft releases and will try to provide compatible controls as soon as possible.

Don't hesitate to contact us if you have further questions.

Kind regards,
Boyan
the Telerik team