Hi,

I have a grid in a window form. In the form's constructor, I initialize the grid columns and band header groups based on a predefined xml file. There is no problem in loading. I can resize any column by draging the column header. However, when I try to resize the band header group by draging the group header, it throws out following exception. I have no idea about this exception. Can someone help? Thanks a lot.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
   at Infragistics.Win.UltraWinGrid.HeaderUIElement.ApplyAdjustment(Point delta)
   at Infragistics.Win.AdjustableUIElement.OnMouseUp(MouseEventArgs e)
   at Infragistics.Win.UltraWinGrid.HeaderUIElement.OnMouseUp(MouseEventArgs e)
   at Infragistics.Win.ControlUIElementBase.ProcessMouseUpHelper(Object sender, MouseEventArgs e)
   at Infragistics.Win.ControlUIElementBase.ProcessMouseUp(Object sender, MouseEventArgs e)
   at Infragistics.Win.Utilities.ProcessEvent(Control control, ProcessEvent eventToProcess, EventArgs e)
   at Infragistics.Win.UltraControlBase.OnMouseUp(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(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)