How to update my DataGrid in Silverlight.

See more:

Silverlight

I have a DataGrid with cellEditingTemplates for one of my tables that does have some Navigation properties within the columns. AutoGenerateColumns is False as I handle each one. All the Bindings are good with the cellEditingTemplates set like {Binding Path=ranks,Mode=TwoWay}, to attempt to update the DG after editing. It does not update, unless I reload it. If I try to make a wrapper class for this entity and add INotifyPropertyChanged to it the CLR states it belongs to the base class - which I see in the model. Each property seems to handle this event so why does it not change? I am using ObserableCollections(Of T) for the ItemsSource from the WCF returned ObjectSets. Any ideas? I have done some serious searches before asking here,

Setting the data:

cbShift.ItemsSource = shifts 'ObservableCollection
cbShift.SelectedValuePath = "ShiftId"

Setting the selection in `CellEditEnding` - per is the Entity object casted from the `DataGrid.SelectedItem` - and is working.

Dim cb = TryCast(dgStaff.CurrentColumn.GetCellContent(dgStaff.SelectedItem), ComboBox)
If Not cb Is Nothing Then
  Dim shiftId As Integer = Convert.ToInt32(cb.SelectedValue)
  per.ShiftId = shiftId
End If

I add this to the Binding: UpdateSourceTrigger=PropertyChanged and it works for the properties of the entity, but not the Navigation Properties.

Thanks for your help...