Anyone have any idea what causes this?  It's an uncaught exception somewhere in my code when I try to change a property on the toolbar.  Just not sure what's causing it...

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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.UltraWinToolbars.UltraToolbarBase.ToolbarToolRow.InternalAddTool(ToolBase tool, Size toolSize, Boolean needsHorizontalSeparator)
   at Infragistics.Win.UltraWinToolbars.UltraToolbarBase.ToolGroup.CalculateMetrics(Int32 maxWidth)
   at Infragistics.Win.UltraWinToolbars.UltraToolbarBase.ToolbarMetrics.CalculateFloatingMetricsHelper(ToolGroup[ toolGroups, Int32 maxWidth)
   at Infragistics.Win.UltraWinToolbars.UltraToolbarBase.ToolbarMetrics.CalculateFloatingMetrics(Size cachedSize, Size delta)
   at Infragistics.Win.UltraWinToolbars.UltraToolbarBase.GetMetrics(Size cachedSize, Size delta)
   at Infragistics.Win.UltraWinToolbars.UltraToolbarBase.ToolAreaInformation.FromToolbar(UltraToolbarBase toolbar, Rectangle overallArea)
   at Infragistics.Win.UltraWinToolbars.ToolbarUIElement.PositionChildElements()
   at Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)
   at Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)
   at Infragistics.Win.UIElement.DrawHelper(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode, Boolean clipText, Boolean forceDrawAsFocused, Boolean preventAlphaBlendGraphics)
   at Infragistics.Win.ControlUIElementBase.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode, Size elementSize, Boolean preventAlphaBlendGraphics)
   at Infragistics.Win.ControlUIElementBase.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode)
   at Infragistics.Win.UltraControlBase.OnPaint(PaintEventArgs pe)
   at Infragistics.Win.UltraWinToolbars.UltraToolbarsDockArea.OnPaint(PaintEventArgs pe)
   at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)
   at System.Windows.Forms.Control.WmPaint(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)