title: Silverlight Telerik RadCombobox Within RadGridView Binding issue
body: <p>I'm binding an editable (you can type in it to add items to the list of choices) radcombobox in a column of a radgridview. It is not throwing a binding error, but it is not updating the bound property (Model.Remarks)</p>
  
  <p>Here are the classes</p>
  
  <pre><code> public class NotamRemarkList : List&lt;string&gt;
      {
          public NotamRemarkList()
          {
              Add("Precision approaches are down; higher weather minimums apply.");
              Add("Due to runway closure, approaches available have higher minimums.");
              Add("All approaches are down; weather must be VFR.");
              Add("Long runway is closed; issue if the other runways are wet.");
              Add("Runway shortened; issue if wet.");
              Add("Airport will be closed at the time we are scheduled in.");
              Add("Runway lights are inoperative; night flights prohibited.");
          }
  
      }
  
   public class NotamViewModel
       { 
          [DataMember]
           public string NewStatus { get; set; }
  
          [DataMember]
           public Notam Model { get; set; }
  
          [DataMember]
           public string NotamGroup { get; set; }
  
          [DataMember]
           public int NotamCount { get; set; }
  
          [DataMember]
           public DateTime? EarliestNotamDepartureTime { get; set; } // min_dep_datetime
  
          [DataMember]
           public string RadioButtonGroupName { get; set; }
       }
  
  
  
  public class Notam
  
   {         
           [DataMember]
           public string Remarks { get; set; }
  
           [DataMember]
           public string TripNumber { get; set; } 
  
          [DataMember]
           public string ArrivalDeparture { get; set; } 
  } 
  </code></pre>
  
  <p>Here's the xaml I have tried for the column - the first one uses a cell template, the second attempts to do everything in a column</p>
  
  <pre><code>                &lt;telerik:GridViewDataColumn Header="Remarks" IsFilterable="False" IsSortable="False" IsReadOnly="False" Width="430"&gt;
                      &lt;telerik:GridViewDataColumn.CellTemplate&gt;
                          &lt;DataTemplate&gt;
                              &lt;telerik:RadComboBox SelectedValue="{Binding Model.Remarks, Mode=TwoWay}" ItemsSource="{StaticResource NotamRemarkList}" IsEditable="True"/&gt;
                          &lt;/DataTemplate&gt;
                      &lt;/telerik:GridViewDataColumn.CellTemplate&gt;
                  &lt;/telerik:GridViewDataColumn&gt;
  
                  &lt;telerik:GridViewComboBoxColumn SelectedValueMemberPath="Model.Remarks" UniqueName="colRemarks"  IsComboBoxEditable="true" IsFilterable="False" IsSortable="False"/&gt;
  </code></pre>