Automatic save of Bitmaps from plotted QuickWin Graphics

Hi there,
when I plot some kind of graphics in a QuickWin Window I can save that file manually as a bmp with file -> save. Is there a way to save that graphic automatical when its being plotted on the screen? I could catch that window with saveimage (x,y...) but I need a more general way to save that graphic.

Thanks in advance,
Markus