I posted #4 and after some more experimenting got things to work. Just needed to c/p cowboy's code literally. In my defense, his comment
"You just have to change the letter to match the button."
mislead me... who would have thought there was a Tkx::i::... method (the "letter i") and most real code wouldn't have used ".b" as the widget id. What a waste of time. FTR, the following snipped works as reported. 

...snip...
my $mw = Tkx::widget->new(".");
  $mw->g_wm_title("Jobs Not Forecasted");
    Tkx::button(".b",
        -text => "18-Letters",
        -background => "red",
        -width => 11,
    -command => sub { print "18L\n"; Tkx::i::call( ".b", "configure", 
+"-background", "blue" ); }
},
    );
    Tkx::pack(".b");
...snip...

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In reply to Re^5: How to change colour of a Tkx button when pressed by Anonymous Monk
in thread How to change colour of a Tkx button when pressed by PerlCowboy

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