We encounter a bug in winform application in .net 2.0 that
often when we press continually on a  NumericUpDown control the
application crash with the following exception :

System.NullReferenceException occurred
 Message="Object reference not set to an instance of an object."
 Source="System.Windows.Forms"
 StackTrace:
      at
System.Windows.Forms.UpDownBase.UpDownButtons.TimerHandler(Object
source, EventArgs args)
      at System.Windows.Forms.Timer.OnTick(EventArgs e)
      at System.Windows.Forms.Timer.TimerNativeWindow.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.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32
dwComponentID, Int32 reason, Int32 pvLoopData)
      at
System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32
reason, ApplicationContext context)
      at
System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32
reason, ApplicationContext context)
      at System.Windows.Forms.Application.Run(Form mainForm)