Hello, In response to your problem about scrolled window :
and wait for the first motion event it delivers after you received a dnd-dropped message (assuming you will move a bit the mouse after dropping down). This way, you get the correct coordinates in the patch, may the window be scrolled or not. 2) you should put a bang gui-object in your gop abstraction. Then, receiving global dnd-dropped msg will "arm" it, and you'll have to click to the gui-bang to confirm the operation. It's not pure "drag and drop" but it is a vanilia approach, and you don't have to calculate about gop coords and margins. Just wait for a click on a bang button.