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Reference
Preferences
Button Options
Display Options
ButtonExpandable
• ButtonExpandable is an option for buttons that determines if the button should expand to fill any GridBox position in which it appears.
• The default setting is ButtonExpandable 
True.
• This setting is typically used for all buttons that appear in palettes.
• With ButtonExpandable False, the size of a button is determined only by its contents, independent of its environment.
• With ButtonExpandable False, gutters will often be left between buttons in a grid box.
• See also: ButtonMargins, ButtonMinHeight, TextJustification.
