void item_Click(object sender, RoutedEventArgs e)
{
selected_group = ((Group)((MenuItem)sender).Tag);
SelectedGroupLabel.Content = selected_group.ToString();
NameTextBox.Text = ((MenuItem)sender).Header.ToString();
}
private void GroupList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (((ListView)sender).SelectedItem != null)
{
selected_group = ((Group)((ListView)sender).SelectedItem);
SelectedGroupLabel.Content = selected_group.ToString();
}
}