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

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

[ 'methodname', args... ], ...

$mw->after( 2000 => configure => $tree, -background => 'green' );