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$ perldoc Tk::Button
BUTTON(1)             User Contributed Perl Documentation            B
+UTTON(1)
...
       -text -textvariable -underline -wraplength

       See Tk::options for details of the standard options.

       Name:     activeBorderWidth
       Class:    BorderWidth
...
           Tk_GetPixels.  This option is typically only available in w
+idgets
           displaying more than one element at a time (e.g. menus but 
+not
           buttons).