Does anyone know if/how to programatically show a control's tooltip?

What I'd like to do is display a valid range for a textbox that will receive numeric input. I don't like the wait window command since I can't position it exactly where I need it (near the control). I thought that if I could fire an event to show the range in the control's tooltip it would be a better solution.

Any thoughts or ideas are appreciated.

TIA

Mike