Hey,
 
I try to draw a rectangle on an output-pane to display a selection. To do so I use the input-model of output-pane.
 
   :input-model '(((:button-1 :motion)
                    tdi++motion-callback)
                   ((:button-1 :release)
                    tdi++motion-callback-reset)))
 
I can draw the rectangle, but I have no clue how to "remove" the old one when I move the mouse and it draws the next one.
 
Is this going in the right direction? Or are there other possibilities?
 
Hope anyone can give me a hint or example on how to solve such drawing / redrawing stuff.
 
best regards,
Philipp