<div class="btn-group umb-button-group" ng-class="{'dropup': direction === 'up'}">

   <umb-button
      type="button"
      action="defaultButton.handler()"
      button-style="success"
      state="state"
      label="{{defaultButton.labelKey}}"
      label-key="{{defaultButton.labelKey}}"
      shortcut="{{defaultButton.hotKey}}"
      shortcut-when-hidden="{{defaultButton.hotKeyWhenHidden}}">
   </umb-button>

   <a class="btn btn-success dropdown-toggle umb-button-group__toggle" data-toggle="dropdown" 