Hi there,

I got a serious problem with my UltraWinGrid: When I double-click on a side of a header column to auto-resize it, a System.NullReferenceException occurs:

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
   at Infragistics.Win.UltraWinGrid.RowAutoSizeLayoutManagerHolder.VerifyCachedLayoutManager()
   at Infragistics.Win.UltraWinGrid.RowAutoSizeLayoutManagerHolder.get_RowLayoutPreferredSize()
   at Infragistics.Win.UltraWinGrid.UltraGridFilterRow.get_BaseHeight()
   at Infragistics.Win.UltraWinGrid.UltraGridRow.get_HeightInsideRowBorders()
   at Infragistics.Win.UltraWinGrid.UltraGridColumn.CalculateCellTextWidth(UltraGridRow row, Graphics gr, StringFormat stringFormat, Int32 maxColWidth)
   at Infragistics.Win.UltraWinGrid.UltraGridColumn.CalculateMaxCellTextWidth(Int32 maxColWidth, RowsCollection rows, Int32 nRows, Int32 maxRowsCollections)
   at Infragistics.Win.UltraWinGrid.UltraGridColumn.PerformAutoResizeHelper(RowsCollection rows, Int32 nRows, Boolean applyWidth, Boolean includeHeader, Boolean includeCells, Int32 maxRowsCollections)
   at Infragistics.Win.UltraWinGrid.UltraGridColumn.PerformAutoResizeHelper(RowsCollection rows, Int32 nRows, Boolean applyWidth, Boolean includeHeader, Boolean includeCells)
   at Infragistics.Win.UltraWinGrid.UltraGridBand.AutoResizeLayoutItem(ILayoutItem autoResizeItem, RowsCollection rowsContext, Size containerSize, UIElement elem)
   at Infragistics.Win.UltraWinGrid.HeaderUIElement.OnDoubleClick(Boolean adjustableArea)
   at Infragistics.Win.ControlUIElementBase.ProcessDoubleClick(Object sender, EventArgs e)
   at Infragistics.Win.Utilities.ProcessEvent(Control control, ProcessEvent eventToProcess, EventArgs e)
   at Infragistics.Win.UltraControlBase.OnDoubleClick(EventArgs 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)