[RESOLVED] Drawing using BackGroundWorker, I don't see my where I'm wrong.

[opus]

I'm using drawing routines that are all called by the .Paint Event of my Control.
The calculation of the objects is done in the Routine "SystemTracks_Simulation", also the positional regions where the objects have been and are now get invalidated. This routine is called once for each Frame.

If I use that routine in the GUI thread, everything works as it should. All the different objects are drawn.
However if I use a BackGroundWorker-thread to call the "SystemTracks_Simulation" the respective objects are most of the time not drawn. Only if I do a ReScale (complete Redraw, i.e. Invalidate without Region) the objects are drawn. If the simulation in running the objects are only shown momentarily (which is the problem), if it isn't running the redraw will show all the objects.



Here are the codelines that call the routine either by the BGW or directly.

If Not MainForm.BackgroundSystemTracksWorker.IsBusy Then
     MainForm.BackgroundSystemTracksWorker.RunWorkerAsync()
Else
      debug_schreiben("SystemTracks_Sim ausgefallen! ")
End If

or

SystemTracks_Simulation()