PaintBox has a couple of hotkeys that can speed up your work.
The following is a list of hotkeys:
• c: switch to cursor mode
• s: switch to selection mode
• r: switch to rectangle draw mode
• o: switch to oval draw mode
• l: switch to line draw mode
• p: switch to polyline draw mode
• g: switch to polygon draw mode
• b: change the present border color
• control + s: save the drawing
• control + shift + s: save the drawing
• control + o: open a drawing
• control + n: create a new drawing
If the hotkeys don't work try clicking on one of the buttons on the tool bar. This should fix the problem.