<hbox>
    <style>
    </style>
    <hbox flex="1" anon-id="container">
        <button class="mdl-button mdl-js-button mdl-button--raised mdl-js-ripple-effect"
                anon-id="button"><span anon-id="buttonDisplay"></span> <i class="material-icons">arrow_drop_down</i></button>
        <ui:Popup anon-id="popup">
            <vbox>
                <ui:ColorSelector anon-id="selector" />
                <ui:ColorSelector anon-id="selector1" />
                <ui:ColorSelector anon-id="selector2" />
            </vbox>
        </ui:Popup>
    </hbox>
</hbox>
