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Specifies name of global variable to set whenever this button is selected. Changes in this variable also cause the button to select or deselect itself. Defaults to the value selectedButton. (#<widget> 'configure #:variable (tk-var 'varname)) You can read Tk-Vars as follows: (get-tk-var 'varname) You can write Tk-Vars as follows: (set-tk-var! 'varname value) |