Thank you for all your replies, guys.

I will try your suggestions.

David: I tried yesterday with setParent API, I hope your example shows how to do it without the form being "inside" (Because the thumbnail would be useless if you can't move it to one side of the form)

Hack: Thank you for your reply... Unfortunatelly I don't want the form to be modal... I will try it, though.

Martin: Thanks for your suggestion, I am going to try it right now.