hi 
i used enterprise guide 3.0,  there is a error when i close it ,,  how can i solove the error?  thanks verymuch ..
System.NullReferenceException
------------------------------ Technical Information Follows ------------------------------
[Syncfusion.Tools] 
 
 ---------------------------------------------------- 
 
    at Syncfusion.Windows.Forms.Tools.DockingManager.set_DHCInFocus(DockHostController value)
   at Syncfusion.Windows.Forms.Tools.DockHost.WndProc(Message& msg)
   at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)System.NullReferenceException
------------------------------ End of Technical Information ------------------------------