protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.ManageContactGroups);
GroupsService groupsService = new GroupsService();
groups = groupsService.GetAll().ToList();
allGroups = groupsService.GetAll().ToList();
MainActivity.SelectedContact.Groups = groupsService.GetAllByContactID(MainActivity.SelectedContact.ID).ToList();
ListView groupsListView = FindViewById <ListView>(Resource.Id.listViewGroups);
Button btnUpdate = FindViewById <Button>(Resource.Id.btnUpdateGroups);
GroupsViewAdapter adapter = new GroupsViewAdapter(this, Resource.Layout.ViewModel, allGroups);
groupsListView.Adapter = adapter;
groupsListView.ChoiceMode = ChoiceMode.Multiple;
//populates all user contact and selects the ones that the contact participates
groupsListView.ChildViewAdded += GroupsListView_ChildViewAdded;
//selects and deselects groups /*ONCLICK BUG */
groupsListView.ItemClick += GroupsListView_ItemClick;
//refreshes the groups of the current contact
btnUpdate.Click += BtnUpdate_Click;
}