Disables the (currently enabled) button bar button that you specify. A disabled button performs no action and has gray text. You might want to disable a button to simplify the button bar display for a particular context.
where buttonName is button0, button1, etc; that is, the name of a currently mapped button.
If the command executes successfully, you receive a Disabled button: buttonName message, and the button's label changes from black text to gray.
See also the enableButton command.