Rooters: quick question. i have a pad in which i have drawn a figure (in this case, the 2-D layout of a detector). i would like to draw other figures on top of this detector (specifically, trajectories). however, i would like to draw them one at a time and, thus, every time i hit a button to draw the next event, i want the old event erased, but the original picture of the layout to remain where it was. is there a quick way to do this? i just don't want to redraw the layout every time a user wants to display a new event. i can think of some solutions, but they are all memory intensive. any suggestions? thanks a bunch, mark szigety
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