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  1. or download this
    use Tkx;
my $mw = Tkx::widget->new(".");
...
$calc->g_bind("<Enter>",
 sub {$calc->configure(-background=>'red');});
Tkx::MainLoop();
  2. or download this
    unknown option "-background" at /TestCode/configtest.pl line 5.
unknown option "-background"
...
    invoked from within
"::perl::CODE(0x4af0d4)"
    (command bound to event)