In HTML you can add an ALT property to an IMG tag so when a user hovers over a picture, a little box appears with a description.

How can I add this feature to a button or other control within my form?

I assume that I would edit the method "MouseEnter" (I am guessing that means when the mouse "enters" the area of the button)?
But I wouldn't even know where to start as far as coding the little box that would appear with a description.

I didn't find anything within the Properties box (like where you can specify the TEXT to appear on a control)
Or perhaps I overlooked it (or its called something that doesn't make it obvious)

Thanks for your help