There is a RBX. rounded gui style on Frames and that is what I want. It is not available on TextButtons itself so if I use a frame as a button, would it work?
It's possible, but not easy, since Frames don't have a MouseButton1Click event like ImageButtons/TextButtons do.
The cleanest way to do it is to create an invisible TextButton on top of the Frame, so you can hook up to the click event.