Crash on opening window

[Dan]

I have some crash reports from users with this stack:

Application_UnhandledException
NullReferenceException
   at Telerik.Windows.Controls.RadWindow.HideSiblings()
   at Telerik.Windows.Controls.RadWindow.OnOpenAnimationCompleted()
   at Telerik.Windows.Controls.RadAnimationManager.InvokeCallbacks(Storyboard storyboard)
   at Telerik.Windows.Controls.RadAnimationManager.StopStoryboard(PlayAnimationInfo info)
   at Telerik.Windows.Controls.RadAnimationManager.OnStoryboardCompleted(Object sender, EventArgs e)
   at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName) 

I don't have any steps to repro yet. This was mostly likely with the Q4 2011 controls. Has anyone seen this?

Thanks.

Dan

[Victor]

Hi Dan,

I believe we already fixed a NullReferenceException in the HideSiblings() method. It was happening because the window was being opened in a certain moment where it failed to find the root panel of the current page.
If you manage to reproduce it however, please do send a sample app so that we can verify that the issue is the same.

Regards,
Victor
the Telerik team