<button>
    <vn-icon
        class="button"
        icon="{{::$ctrl.icon}}">
    </vn-icon>
</button>
<vn-drop-down
    vn-id="drop-down"
    on-select="$ctrl.onDropDownSelect(item)"
    ng-click="$ctrl.onDropDownClick($event)">
</vn-drop-down>