Hi Stoyo

When custom behaviour is implemented and only OnMouseDown function is overriden and it returns "false" I get following exception when mouseUp function of BaseBehaviour gets invoked.

-----------
  at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   at System.Nullable`1.get_Value()
   at MindFusion.Diagramming.Silverlight.BehaviorBase.OnMouseUp(MouseButtonEventArgs e)
   at Tutorial3.DragSegmentsBehavior1.OnMouseUp(MouseButtonEventArgs e)
   at MindFusion.Diagramming.Silverlight.Diagram.x66c89b500bffc63d(Object xe0292b9ed559da7d, MouseButtonEventArgs xfbf34718e704c6bc)
   at System.Windows.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)
-----------

By overriding mouseUp event in custom behavior class and not calling base.MouseUp(e) works properly.

In my custombehavior class, I am implementing different type of possiblities and to avoid above exception I need to declare some varilable which controls this bug.
Will you please make sure this issue gets fixed in release 1.4

Regards
Rajesh

Hi Stoyo

if I call base.OnMouseDown(e) before returning false, it will start the default behaviour.

For eq. deriving my class from LinkShapesBehaviour will start creating link if mouse down event occurs on node and if mousedown is somewhere in diagram then, new node creation behaviour gets trigerred.

-Rajesh