DATAGRIDCOMBOBOXCOLUM won't change itemssource

[pmeloy]

I've used Combos inside datagrids a lot and never had any problems but for some reason on this one page it doesn't. When I try to change the entry I get a cellendedit event but the cell stays selected and shows a thin red line around the outside. I can't open any other combobox in the display either. I populate it with an enum converted to an observable list and bind the column to a datatable.

    Public Enum ItemTypes As Integer
        ignore
        Products
        Ingredients
        Consumables
        Taxation
        Equipment
        Utilities
        Maintenance
        Rentals
        Monthly
        Other
        Last
    End Enum

   Public Function GetSubTypesCollection() As ObservableCollection(Of ItemsClass)
        Dim col As New ObservableCollection(Of ItemsClass)
        For i = 4 To ItemTypes.Last - 1
            Dim entry As New ItemsClass([Enum].GetName(GetType(ItemTypes), i), i)
            col.Add(entry)
        Next
        Return col
    End Function

       Dim cbCol = New DataGridComboBoxColumn
        cbCol.Header = "Type"
        cbCol.ItemsSource = GetSubTypesCollection()
        cbCol.DisplayMemberPath = "Name"
        cbCol.SelectedValuePath = "ID"
        cbCol.SelectedValueBinding = New Binding("typeid")
        cbCol.Width = New DataGridLength(1, DataGridLengthUnitType.Star)
        dg.Columns.Add(cbCol)

The only thing I can think of would be that the selectedvalue is something the datatable doesn't like. I msgbox() the entire collection and made sure it was just integers though (typeid is an integer column too).
Oh the datagrid declaration!

            <DataGrid Name="dg" Grid.Row="0" Grid.Column="0"  IsReadOnly="False" CanUserAddRows="False" CanUserDeleteRows="False" AutoGenerateColumns="False"/>

I am about to erase and redo it all but I'm hoping someone can spot my error

[pmeloy]

Ack I figured it out. I messed up creating the list of classes so the ID is a string, not a number. I was looking at the wrong observablecollection before. It doesn't like a string to set an integer field. Go figure!

[pmeloy]

Actually no, that wasn't it. I set up a test combobox to see what the selectedvalue would be but messed up and said SelectedValue instead of SelectedValuePath. Once I noticed and fixed that the list is working fine. I double checked the comboboxcolumn and it is fine too. Still a mystery... I will probably see if tomorrow morning first thing and think "How dumb am I to not see that?"

[pmeloy]

I finally found out how to get the value of a datagrid cell. Cast e.EditingElement to the type of column then just use it like any other control

    Private Sub dg_CellEditEnding(sender As Object, e As DataGridCellEditEndingEventArgs) Handles dg.CellEditEnding
        Dim mycb As ComboBox = CType(e.EditingElement, ComboBox)
        MsgBox(mycb.Text + " " + mycb.SelectedValue.ToString)

        'btnCommit.IsEnabled = True
        'btnReject.IsEnabled = True
    End Sub

I checked and the combobox does indeed have a valid selectedvalue. The mystery deepens