• ButtonExpandable is an option for ButtonBox which specifies whether the button should expand to fill any GridBox position in which it appears.
• The default setting is ButtonExpandable->True.
• This setting is usually used for all buttons that appear in palettes.
• With ButtonExpandable->False the size of a button is determined purely by its contents, independent of its environment.
• With ButtonExpandable->False
, gutters will often be left between buttons in a GridBox
• New in Version 3.