Use the -anchor option for the label widget. The -justify option determines how multiline text is aligned. 

    $self->Component(
        'Label'     => 'label',
        -anchor     => 'w',
        # -justify  => 'left'
        )->pack(-side => 'left', -anchor => 'w');

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In reply to Re: Justifying a label inside a Tk megawidget by hangon
in thread Justifying a label inside a Tk megawidget by monksp

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