<md-menu md-offset="0 50" md-ink-ripple>

 <a ng-click="$ctrl.openMenu($mdOpenMenu, $event)" class="md-button">
   {{$ctrl.activeGroup.name || "Please choose a group..."}}
   <i class="fa fa-caret-down md-caption"></i>
 </a>
 <md-menu-content>
   <md-menu-item ng-repeat="groupitem in $ctrl.groups">
     <md-button ui-sref="groupDetail({ id: groupitem.id })">
       <i class="fa fa-circle-o"> </i>
       {{ groupitem.name }}
     </md-button>
   </md-menu-item>
   <md-menu-item>
     <md-button href="#!/group/find" class="group-menu-join-button">
       <i class="fa fa-plus"></i>
       Join community (not implemented)
     </md-button>
   </md-menu-item>
 </md-menu-content>
</md-menu>

<md-menu md-offset="0 50" md-ink-ripple>

 <a ng-click="$ctrl.openMenu($mdOpenMenu, $event)" class="md-button">
   {{$ctrl.activeGroup.name || "Please choose a group..."}}
   <i class="fa fa-caret-down md-caption"></i>
 </a>
 <md-menu-content>
   <md-menu-item ng-repeat="groupitem in $ctrl.groups"
                 ng-if="groupitem.id !== $ctrl.activeGroup.id">
     <md-button ui-sref="groupDetail({ id: groupitem.id })">
       <i class="fa fa-circle-o"> </i>
       {{ groupitem.name }}
     </md-button>
   </md-menu-item>
   <md-menu-item>
     <md-button href="#!/group/find" class="group-menu-join-button">
       <i class="fa fa-plus"></i>
       Join community (not implemented)
     </md-button>
   </md-menu-item>
 </md-menu-content>
</md-menu>

Hide active group in menu
Hide active group in menu
