Documentation at
http://www.purl.org/tcl/home/man/tcl8.4/TkCmd/button.htm .

A button is a widget which is typically used by a GUI programmer to receive
a simple command from the user - a "press here to submit" type idea is
typically represented by a button.

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Newcomers to Tk often experience several problems whose symptom is that
"the button doesn't work right".  For details on these sorts of topics,
see the FMM [http://starbase.neosoft.com/~claird/comp.lang.tcl/fmm.html#button].





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