avoiding weird effects when moving the video grabber window

[Doug Lerner]

When the video grabber window first appears it is in the upper left corner
and then jumps into my step because I have set its rectangle in the
openStack handler.

Similarly, when I move the stack "containing" the video grabber, first the
stack moves and then the video grabber comes after it.

Any way of avoiding these two odd effects?

Thanks,

doug