My bad, I was using: Tkx::ttk__button()
whereas your code used: Tkx::button()
Sigh. BTW: I am writing my very 1st Tkinter code, so your help is greatly appreciated.

The latter surely supports "-background".
However, I still cannot get the color to change.
So, I reduced your example to 2 buttons, code at bottom.

One confusion is "what replaces the 'i' in: Tkx::i:..."
as noted in your "I FIGURED IT OUT" response:

  Tkx::i::call(".b", "configure", "-background", "blue");
Your response says:
  "You just have to change the letter [I presume ::i::] to match the button."
The other confusion: where is the syntax to spec what gets "call"'ed...
  "Undefined subroutine &Tkx::button::call...:
Complete runtime error is below.

For ref, the following 2-command example works fine:
  -command => sub { print "18L\n"; print "18L #2\n"; },
So I tried the following (yep, some desperation flailing...):
  -command => sub { print "18L\n"; Tkx::.b::call(".b", "configure", "-background", "blue"); },
  -command => sub { print "18L\n"; Tkx::button::call(".b", "configure", "-background", "blue"); },
  -command => sub { print "18L\n"; Tkx::".b"::call(".b", "configure", "-background", "blue"); },
#3 = syntax error (obviously)
#1 and #2 = the following runtime (Application) error, after clicking the "18-Letters" button:

Undefined subroutine &Tkx::button::call called at H:\NotPhotos\Computer\Raspberry_Pi\Perl\test2.pl line 15.
Undefined subroutine &Tkx::button::call called at H:\NotPhotos\Computer\Raspberry_Pi\Perl\test2.pl line 15.
    while executing
"::perl::CODE(0x4de7f0)"
    invoked from within
".b invoke"
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 list $w invoke"
    (procedure "tk::ButtonUp" line 24)
    invoked from within
"tk::ButtonUp .b"
    (command bound to event)

use strict;
use warnings;
use Tkx;
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"; print "18L #2\n"; },  # OK
#  -command => sub { print "18L\n"; Tkx::.b::call(".b", "configure", "
+-background", "blue"); },    # BAD, runtime error
#  -command => sub { print "18L\n"; Tkx::button::call(".b", "configure
+", "-background", "blue"); },# BAD, runtime error
#  -command => sub { print "18L\n"; Tkx::".b"::call(".b", "configure",
+ "-background", "blue"); },  # BAD, syntax error
    );
    Tkx::pack(".b");
                    
    Tkx::button(".s",
        -text => "EXIT",
        -width => 11,
        -command => sub { Tkx::destroy("."); },
    );
    Tkx::pack(".s");
    Tkx::MainLoop();

[download]

In reply to Re^4: 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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