Thanks,but:
Zaei: Your code does somethig, but their must be a mistake in it, 'cause the picture stays fixed?? Although the other parts of the forms have a new flickering if I use that function??

gaffa: I was thinking about something like that, the whow is my problem, I did something like that with old QBX, but I think it does not work for Shape- and Line-Objects. Do you some more specific help?