Hilmar.
This will work, except in the case where you resize the form and keep it at one size for a few seconds (or longer) before releasing the mouse in that same position. In this case the resize doesn't get called (because your mouse is staying in the same position) and you haven't let your mouse up, so the timer is running. I tried this in my code and I still have the problem with it running the code many times (the longer you hold the resize in the same position, the more times it runs)
Thanks
Matt