i got an idea.. how about putting a layer with transparent fill above the image and the transparent image? the layer at the bottom has no signal handler, instead the the layer with transparent fill recieved the signal and when moved, it moves and let the image at the bottom be dragged along with it. its like sandwiching the "transparent image w/ hole" between the "image" and the "transparent filled rectangle" !! maybe i try to make an example later. :D