After upgrading my project I get an error on some grids after i click a cell and then close the form that the grid is on. I cannot find the cause anywhere.    I just single click a cell that is readonly, then close the form with the windows X and the error comes up.  A try Catch in the form closing doesnt catch it.

This is critical so please let me know quickly if you have any clue what the problem is.

The error is:

Object reference not set to an instance of an object.

StackTrace:    at Infragistics.Win.UltraWinGrid.UltraGridColumn.get_IsFirstVisibleColumnOnLevel()

   at Infragistics.Win.UltraWinGrid.UltraGridCell.CalculateCellOverlayRect(UIElement element, Int32 borderWidth, Boolean calculateInvalidRect)

   at Infragistics.Win.UltraWinGrid.UltraGridCell.InvalidateElem(UIElement element, Boolean recalcRects)

   at Infragistics.Win.UltraWinGrid.GridItemBase.InvalidateItem(RowScrollRegion rsr, ColScrollRegion csr, Boolean recalcRects)

   at Infragistics.Win.UltraWinGrid.GridItemBase.InvalidateItem()

   at Infragistics.Win.UltraWinGrid.UltraGrid.InvalidateActiveRowCell()

   at Infragistics.Win.UltraWinGrid.UltraGrid.OnLostFocus(EventArgs e)

   at System.Windows.Forms.Control.WmKillFocus(Message& m)

   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)

There is also another error I get when trying to open the Designer for the form.

Object of type 'Infragistics.Win.UltraWinGrid.UltraGrid' cannot be converted to type 'Infragistics.Win.UltraWinGrid.UltraGrid'.