Hello.
Im programming a Windows Forms application that has many user controls (e.g.
charts).  These user controls have System.Threading.TimerCallback functions.  
These functions Invoke other member methods that update the user controls
e.g.:

private void OnTimerUpdate(object pState)
{
if( mMainChart.InvokeRequired )
{
    Invoke(new UpdateAndCleanUpChartDelegate(UpdateAndCleanUpChart));
}
else
{
    UpdateAndCleanUpChart();
}
}

After calling Application.Exit() I get a bunch of message boxes with the
following messages:

System.ObjectDisposedException: Cannot access a disposed object named
"ParkingWindow".
Object name: "ParkingWindow".
  at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate
method, Object[] args, Boolean synchronous)
  at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
  at System.Windows.Forms.Control.Invoke(Delegate method)
  at MyChartClass.OnTimerUpdate(Object pState)An unhandled exception of
type 'System.ObjectDisposedException' occurred in system.windows.forms.dll

Additional information: Cannot access a disposed object named "ParkingWindow".

This happens randomly, i.e. for different user controls each time.

Could anyone help me out here, how do I prevent this or handle the problem.
Regards,