You need to handle MouseRightButtonDown event, find the element underneath and get its corresponding data item. It could be something like follows:
private void clubsGrid_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
var clickedElement = e.OriginalSource as FrameworkElement;
if (clickedElement != null)
var item = clickedElement.DataContext as Club;
If you want to select that item, you can just assign it to the SelectedItem property.
the Telerik team