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$mw->after( 'idle', [configure => $styleref_select_parent, 
                     -background => 'cyan' ],
);

         after(*ms*, *callback*?).

        sub brscmd {
             my ($previous_index, $actual_index) = @_;
...
                       from curselection <$js>\n";
                }
             }

        sub brscmd {
             my ($previous_index, $actual_index) = @_;
...
             }
        );
}