private void XToolsApp_ServerDisconnected(MixedRealityToolkit.Sharing.NetworkConnection connection)
 {
     if (this.IsValid)
     {
         OnPropertyChanged("IsValid");
         ClearUsers();
     }
 }
 private void XToolsApp_ViewerConnectionChanged(MixedRealityToolkit.Sharing.NetworkConnection obj)
 {
     OnPropertyChanged("IsViewerConnected");
 }