There is nothing uniqe in the code, but I'll post it anyhow.

my $cb_update_actual    = $FrameDataToAnalyze -> Checkbutton(    -text
+=>"",
                                -offvalue=>0,
                                -onvalue=>1,
                                -command=> sub {
                                    if ($UpdateActual) {
                                        $entry_actual_value->configure
+(-state=>"normal");
                                    } else {
                                        $entry_actual_value->configure
+(-state=>"disabled");
                                    }
                                },
                                -variable=>\$UpdateActual);
$cb_update_actual -> select();
[download]

Well, in the code you posted there's no colour specification whatsoever.

Doesn't

my $cb_update_actual    = $FrameDataToAnalyze -> Checkbutton(
    ...
);
$cb_update_actual->configure(
    -activebackground => $cb_update_actual->cget('-background'),
    -activeforeground => $cb_update_actual->cget('-foreground'),

);
[download]

do the trick?

What is it that keeps changing? is it $FrameDataToAnalyze or $cb_update_actual ?

No colur specification because I still don't know how to get what I want... ;-)

The box where you put the 'x' of the Checkbutton changes.