vcmd

vmcd is an abbreviation of validatecommand.

Specifies a command to evaluate when you want to validate the input in the widget. Setting it to '() disables this feature (the default). Validation occurs according to the value of #:validate. This command must return #t or #f. If it returns #f then the value of the widget will not change and the invalidCommand will be evaluated if it is set. If it returns #t, then value will be changed. See Validation below for more information.


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