Select Code to Download

    $txtSummary = $root->Scrolled(
        'Text',
...
        -width      => '40',
        -scrollbars => 'oe'
    )->pack;

    $txtSummary->Subwidget( 'yscrollbar' )->configure(
        -command    => [ 'yview' => $txtSummary ]
    );