Buttons generate callbacks when they are clicked by the user. You
control exactly when and how by changing the values for type()
The Fl_Round_Button subclass display the "on" state by
turning on a light, rather than drawing pushed in. The shape of the
"light" is initially set to FL_ROUND_DOWN_BOX. The color of the light
when on is controlled with selection_color(), which defaults to
Creates a new Fl_Round_Button widget using the given
position, size, and label string.
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