 
toggleButtonF :: (Graphic a) => a -> F Bool Bool
toggleButtonF label
True or False to switch on or off the button
	under program control.
True when the button is switched on, False when it is
	switched off.
label :: a
toggleButtonF "Run"
 
Customisable version: toggleButtonF'.
Related fudgets: buttonF, menuF, radioGroupF, toggleF.