Thanks.

Here's a short sample that determines the clicked record based on a mouse event. You can register for this event in XAML or in code. Code sample:

XamDataGrid grid = GetEditorGrid();
grid.PreviewMouseRightButtonDown += OnGridRightMouseButtonDown;

The event handler looks like this:

/// <summary>
/// Activates the record under the cursor if the right mouse button
/// is pressed.
/// </summary
protected virtual void OnGridRightMouseButtonDown(object sender, MouseButtonEventArgs e)
{
  Record record = UIHelper.TryGetClickedRecord(sender, e);
  if (record != null)
  {
    //do something with the record
  }
}

And this is the helper method that returns the record. 

/// <summary>
/// Gets a grid's clicked record.
/// </summary>
public static Record TryGetClickedRecord(object sender, MouseButtonEventArgs e)
{
  //get the cursor position and the item under the cursor
  XamDataGrid grid = (XamDataGrid) sender;
  Point p = e.GetPosition(grid);
  DependencyObject obj = grid.InputHitTest(p) as DependencyObject;

  //if there is nothing under the cursor, return
  if (obj == null) return null;

  //check if we're dealing with the presenter itself
  CellValuePresenter presenter = obj as CellValuePresenter;
  if (presenter == null)
  {
    //look up the visual tree
    presenter = FindParent<CellValuePresenter>(obj);
  }

  //return the presenter's record, if possible
  return presenter == null ? null : presenter.Record;
}

HTH

Philipp