InvalidCastException when RadComboBox dropdown is opened

2 posts, 0 answers
  1. brandon
    brandon avatar
    1 posts
    Member since:
    Sep 2010

    Posted 28 Sep 2010 Link to this post

    Hi there,

    Occasionally I will get this exception while trying to open the drop down menu of the RadComboBox:

    {System.InvalidCastException: Unable to cast object of type 'MS.Internal.ManagedObjectReference' to type 'Telerik.Windows.Controls.Animation.AnimationSelectorBase'.
       at Telerik.Windows.Controls.Animation.AnimationManager.GetAnimationSelector(DependencyObject obj)
       at Telerik.Windows.Controls.Animation.AnimationManager.Play(FrameworkElement target, String animationName, Action completeCallback, Object[] args)
       at Telerik.Windows.Controls.RadComboBox.<>c__DisplayClass5.<OpenDropDownInternal>b__4(Object sender, EventArgs e)
       at Telerik.Windows.Controls.PopupWrapper.OnPopupOpened(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)}

    Do you have any idea what causes this?  I am using an internal build of the telerik Silverlight 4 controls that I downloaded from the telerik site on September 3rd. (v. 2010.2.903.1040)

    I tried disabling the animations on the RadComboBox but that did not fix the issue.  There isn't anything special about the code; the RadComboBox simply has its ItemsSource property databound to a List<'T> in my view model.

  2. George
    George avatar
    1332 posts

    Posted 01 Oct 2010 Link to this post


    We are not aware of such issue with RadComboBox control. Could you please try our Q2 Service Pack 2 release and let me know if you still have any problems with RadComboBox control.

    I will be glad to assist you further. 

    All the best,
    the Telerik team
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