private void TaskButton_MouseDown(object sender, MouseButtonEventArgs e)
 {
     NewsButton.UpdateColorToStart();
     TaskButton.UpdateColorToEnd();
     Items.ItemsSource = ((UserViewModels)DataContext).Admins;
     BindingOperations.DisableCollectionSynchronization(((UserViewModels)DataContext).NormalUsers);
     BindingOperations.EnableCollectionSynchronization(((UserViewModels)DataContext).Admins, Items.ItemsSource);
 }
 private void TaskButton_MouseDown(object sender, MouseButtonEventArgs e)
 {
     NewsButton.UpdateColorToStart();
     TaskButton.UpdateColorToEnd();
     this.DataContext = new NewsViewModels(false);
 }