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