title: Show ComboBox on Datagrid row edit, WPF
body: <p>I have a <code>DataGrid</code> with data in my WPF 4 desktop-based application.
  When a user clicks twice on row <code>DataGrid</code> switches to edit mode, where a user can change values of a cell. Now I want that on specific cell user can only choose values from the combo box, e.g. gender — male/female and not to type something else.</p>
  
  <p>How can I show combo box in edit mode of <code>DataGrid</code>?</p>