I use an UltraTree in OutlookExpress StyleView.

With a name, value Column set, i add an EditorWithCombo to the value cell (DataType is string)

The EditorWithCombo use a class dervied by DefaultEditorOwner to fill the EditorWithCombo with a ValueList, that contains Enum Values.

Everything is displayed correctly, but when i select an item from list, following exception occurs:

Additional information: Object reference not set to an instance of an object.


Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.
   at Infragistics.Win.ValueList.Infragistics.Win.IValueList.CloseUp()
   at Infragistics.Win.EditorWithCombo.DoCloseUp()
   at Infragistics.Win.EmbeddableEditorBase.CloseUp()
   at Infragistics.Win.EditorWithCombo.Infragistics.Win.IValueListOwner.OnCloseUp()
   at Infragistics.Win.ValueListDropDown.OnCloseUp(Boolean closeDropDownManager)
   at Infragistics.Win.ValueListDropDown.OnMouseUp(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at Infragistics.Win.ValueListDropDownUnsafe.WndProc(Message& message)
   at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)

I am using Infragistics version: 6.3.20063.1059