I see ofcorse! THANKS!
I have a setup pgm where all "user stuff" is done, and on return from the setup i found the events BeforeDrawBackWall and BeforeDrawBackground is fired...
....
But I foregot to mention:
if one, by some reason, "have to use the event", one could use the GradientFill with same color as from/to like this:
bmp.Canvas.GradientFill(Rect(0, 0, bmp.Width, bmp.Height), clSkyBlue, clSkyBlue , gdVertical);
...
May be there should be some derivat of GradientFill, called just "Fill"..