Two aproaches:
1. Set a small caption and a Tooltip
2. Have you seen the Compile icon from Visual C++? it seems good for that pourpose. Maybe the Icon than comes in Word to create Formulas? the f(x) or Sum icons that comes with Excel?, The modules icon that comes with VisualBasic?
Hope this help
Mauricio
Be fast like the Fox
Be free like the Penguin
Se Rápido como el Zorro
Se libre como el Pingüino