title: How to change the DataContext of a button to the parents parent DataContext?
body: <p>I have 2 Classes in WPF:</p>
  
  <ul>
  <li>Meeting</li>
  <li>People</li>
  </ul>
  
  <p>In meeting I have 2 <code>ObservableCollections</code>; <code>AttendingMeeting</code> and <code>NotAttendingMeeting</code> that contain <code>People</code> objects</p>
  
  <p>In the xaml the <code>DataContext</code> are set to <code>Meeting</code>, and I have 2 <code>DataGrid</code>s (<code>AttendingMeeting</code> and <code>NotAttendingMeeting</code>) </p>
  
  <p>I need to add a <code>Button</code> to each of the <code>DataGrid</code>s to add and remove from <code>Meeting</code>, But then I need to change the <code>DataContext</code> on the <code>Button</code> from e.g.: <code>AttendingMeeting</code> to <code>Meeting</code>, so that the <code>Meeting</code> class can handle the adding and removing <code>People</code> from the <code>ObservableCollection</code>s.</p>
  
  <p>How can I do this in xaml (changing the <code>DataContext</code> from <code>AttendingMeeting</code> items to the parents <code>parent-&gt; Meeting</code>)?</p>