Hello 

Null pointer exception occurred on Explorer bar while loading. The stack trace of the exception is as follow:

System.NullReferenceException: Object reference not set to an instance of an object.
   at Infragistics.Win.UltraWinExplorerBar.UltraExplorerBar.ItemFromPoint(Point point)
   at Infragistics.Win.UltraWinExplorerBar.UltraExplorerBar.Infragistics.Win.UltraWinExplorerBar.IItemContainer.ItemFromPoint(Point point)
   at Infragistics.Win.UltraWinExplorerBar.UltraExplorerBar.OnMouseDownHelper(IItemContainer itemContainer, MouseEventArgs e)
   at Infragistics.Win.UltraWinExplorerBar.UltraExplorerBar.OnMouseDown(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

This exception occurs in the following scenario:

I am using ultraGrid on one form, and when double click on any record. this form is closing and another form is opening which contains the ultraExplorerBar. Now when ever i click the mouse 3 times on any record, the second form throws the above exception. The exception is throwned on the ShowDialog() line. Please help how to avoid this exception.

Thank You