I am trying to bind to an observablecollection of string. 

When I do not set the valuepath property of the xamcomboeditor it does not display an initial value even though I set an initial value in the init method of my datagrid and the initial value is one of the items in the combobox.

If I set the valuepath property to "Value", the xamcomboeditor dissplays an initial value however it is not the value I set in the init method.  Also, the value is not bound to the dataitem (dataitem value is always null).

I tried changing the observable collection to a dictionary of string, string based on this post: http://community.infragistics.com/forums/t/54920.aspx. and again the initial value of the combo box is not displayed.
Here is the XAML:

<igDP:Field Name="CLASS" Label="Class">
 <igDP:Field.Settings>
  <igDP:FieldSettings>
   <igDP:FieldSettings.EditorStyle>
    <Style TargetType="{x:Type igEditors:XamComboEditor}">
     <Setter Property="ItemsSource" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.RuleClasses}"></Setter>
     <Setter Property="ValuePath" Value=""></Setter>
     <Setter Property="DisplayMemberPath" Value=""></Setter>
     <Setter Property="Value" Value="{Binding DataItem.CLASS, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"></Setter>
    </Style>
   </igDP:FieldSettings.EditorStyle>
  </igDP:FieldSettings>
 </igDP:Field.Settings>
</igDP:Field>         
         
I set the initial values for a new row in the init evennt of the datagrid:

private void InitRule(object sender, InitializeTemplateAddRecordEventArgs e)
{
 e.TemplateAddRecord.SetCellValue(e.TemplateAddRecord.FieldLayout.Fields["CLASS"], TBARule.Classes.Roll );
 e.TemplateAddRecord.SetCellValue(e.TemplateAddRecord.FieldLayout.Fields["TYPE"], TBARule.Types.ACE);
 e.TemplateAddRecord.SetCellValue(e.TemplateAddRecord.FieldLayout.Fields["ALLOW_IND"], "Y");
}
  
  
How can I fix this please?  I would prefer to use an observablecollection or list if possible.

Thanks,

Sam