This section discusses the unique features of each kind of gadget
supported by the GadTools library.

 button gadgets 
 text-entry and number-entry gadgets 
 checkbox gadgets 
 mutually-exclusive gadgets 
 cycle gadgets 
 slider gadgets 
 scroller gadgets 
 listview gadgets 
 palette gadgets 
 text-display and numeric-display gadgets 
 generic gadgets