Error with Drop Property

[soms]

hi,

i am using RadDragandDropManager Control. i am using three events for Rad Scheduler as follows:

 RadDragAndDropManager.AddDragQueryHandler(this, OnDragQuery);
 RadDragAndDropManager.AddDropQueryHandler(this, OnDropQuery);
 RadDragAndDropManager.AddDropInfoHandler(this, OnDropInfo);

After Completing the OnDropInfo event I have get Following Error. i can no understand why it is coming. The Complete Error Details are as Follows:

{System.NullReferenceException: Object reference not set to an instance of an object.

   at Telerik.Windows.Controls.TimeSlotItemsControl.OnTimeSlotItemsControlDropInfo(Object sender, DragDropEventArgs e)

   at Telerik.Windows.Controls.DragDrop.DragDropEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)

   at Telerik.Windows.RadRoutedEventArgs.InvokeHandler(Delegate handler, Object target)

   at Telerik.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RadRoutedEventArgs routedEventArgs)

   at Telerik.Windows.RouteItem.InvokeHandler(RadRoutedEventArgs routedEventArgs)

   at Telerik.Windows.EventRoute.InvokeHandlersImpl(Object source, RadRoutedEventArgs args, Boolean raisedAgain)

   at Telerik.Windows.EventRoute.InvokeHandlers(Object source, RadRoutedEventArgs args)

   at Telerik.Windows.RadRoutedEventHelper.RaiseEvent(DependencyObject element, RadRoutedEventArgs args)

   at Telerik.Windows.DependencyObjectExtensions.RaiseEvent(DependencyObject element, RadRoutedEventArgs e)

   at Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.RaiseDropInfo()

   at Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.OnRealDrag(IMouseEventArgs e)

   at Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.OnCoverRectangleMouseMove(Object sender, MouseEventArgs 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)}

Please Help me. Its Urgent.

[Tsvyatko]

Hello soms,

Could you please let us know the version of our controls used. Also, I can suggest to try our latest official release.
All the best,
Tsvyatko
the Telerik team

[soms]

Hi,

i am using "RadControls_for_Silverlight_4_2010_1_0603_DEV". After Completing the DropInfo event its produce the error as "Object Reference not et an instace an object".

[Vlad]

Hi,

This is our Q1 2010 SP1. It will be better to use our latest service pack - Q3 2010 SP1.

Regards,
Vlad
the Telerik team