This is a test project to see how well it would work to make an Undo feature for the pen. How it works: Hold down the mouse button and drag across the screen to draw. When drawing, the X and Y coordinates of each point of the drawing are saved to 2 lists. When the undo button is clicked, it clears and redraws everything except for the last few points. This way it "undo's" the last few changes to the drawing. This is quite glitchy, but it is only a test and is not fully complete. Thanks for viewing. Scratch On!