I had actually thought of that already, but add a position glyph and mousedown condition. The best control, however, would be one that when the user presses the mouse button and moves the mouse, the picture playfield scrolls behind a window and the mouse pointer stays still, like a simulated trackball. I've seen this kind of control on other hardware control programs. This would use up far less real estate on the front panel, but I don't know if it can be done in LabView.