title: In flutter, RaisedButton has disabledColor option in its constructor but no option to disable it?
body: <p>In flutter, <code>Raisedbutton</code> has <code>disabledColor</code> option in its constructor but not any option to disable it? So how can someone apply the <code>disabledColor</code> when there is no information about whether <code>RaisedButton</code> is disabled or not.</p>