title: wpf button click event
body: <p>In this <a href="https://stackoverflow.com/questions/4720446/wpf-adding-tabitems-dynamically/4722047#4722047">question</a> I asked about adding <code>TabItems</code> dynamically to a <code>TabControl</code>
  the <code>ItemsSource</code> are from <code>ObservableCollection&lt;Village&gt;</code>..
  My question is if added a button to any <code>TabItem</code>, this button will have the <code>DataContext</code> of its container <code>TabItem</code>, how could I implement the Click event for this button?</p>