title: WPF ComboBox/ComboBoxEdit in Datagrid/GridControl Row ItemsSource from outside row
body: <p>i have a DevExpress ComboBoxEdit inside a GridControl.
  Afaik ComboBox inside a DataGridRow has the same problem.</p>
  <p>EditValue is inside the row-object:</p>
  <pre><code>EditValue=&quot;{Binding Row.Selected}&quot;
  </code></pre>
  <p>Thats ok.</p>
  <p>Currently the ItemsSource = List of all possible options is also inside the row-object.</p>
  <pre><code>ItemsSource=&quot;{Binding Row.AllPossibilities}&quot;
  </code></pre>
  <p>It works but i don't like to clutter the object too much - it has then to contain lists of every possible option for most of the properties.</p>
  <p>Thats why i what to chance the ItemsSource to be in the DataContext of the WPF UserControl instead the DataContext of the GridControl inside the UserControl.</p>
  <p>I tried setting the ItemsSource with Path and name in the UserControl DataContext but got XAML-Bindingerror that the Property is not found in object of type &quot;EditGridCellData&quot;</p>
  <p>Is that even possible? If yes, how?</p>