Pressing TAB causes a 'Object not set..' error

The latest build of this product (v2.0.0208) was released 20 years ago, which was before this thread was created.

Posted 20 years ago by tony_coupland

Does any one else experience pressing TAB (or Alt+Tab) causing their application to throw a Object variable not set error message?

I cannot point the finger directly at the Actipro control due to a vauge stack trace message


   at System.Windows.Forms.UnsafeNativeMethods.DefFrameProc(IntPtr hWnd, IntPtr hWndClient, Int32 msg, IntPtr wParam, IntPtr lParam)
   at System.Windows.Forms.Form.DefWndProc(Message& m)
   at System.Windows.Forms.Control.WmUpdateUIState(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ContainerControl.WndProc(Message& m)
   at System.Windows.Forms.Form.WndProc(Message& m)
   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.SendMessage(HandleRef hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at System.Windows.Forms.Control.ProcessUICues(Message& msg)
   at System.Windows.Forms.Control.PreProcessMessage(Message& msg)
   at System.Windows.Forms.ThreadContext.System.Windows.Forms.UnsafeNativeMethods+IMsoComponent.FPreTranslateMessage(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)

but since I am not using any 'unsafe' native methods I thought I'd pose the question here.

Regards,
Tony Coupland

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