WPF ListBox - refresh - wpf

Question

I have a ListBox populated by a DataTable - adding items, moving items all work but delete doesn't - it reflects in the DataTable but clears all items from the ListBox unless it is reloaded as part of a SelectionChanged event.
I have tried Listbox.Items.Refresh and setting the ItemsSource to Nothing and re-assigning back to the DataTable.
Any ideas?
Thanks
Private Sub Reports_BalanceSheet_NominalListBox_Delete(NomLB As String, DT As DataTable)
Try
Dim LB As ListBox = Reports_BalanceSheet_Grid.FindName(NomLB)
If LB.SelectedIndex = -1 Then
AppBoxValidation("No item has been selected for deletion!")
Exit Sub
End If
Dim FR() As DataRow = DT.Select("ID = " & LB.SelectedValue, Nothing)
Dim CatID As Integer = 0
For Each row As DataRow In FR
CatID = row("CatID")
row.Delete()
Next
DT.AcceptChanges()
Dim vDV As New DataView(DT)
vDV.RowFilter = "FormID = " & FormID & " AND CatID = " & CatID
vDV.Sort = "Position"
DT = vDV.ToTable
vDV = Nothing
Dim i As Integer = 0
For Each row As DataRow In DT.Rows
row("Position") = i
i += 1
Next
With LB
.ItemsSource = DT.DefaultView
.DisplayMemberPath = "Name"
.SelectedValuePath = "ID"
End With
Catch ex As Exception
EmailError(ex)
End Try
End Sub

Answer 1

Turns out the clue was 'unless it is reloaded as part of the SelectionChanged event'
added this to the end and it all works perfectly :-)
Have you ever noticed that you can spend hours going round in circles and the moment you post the problem you figure it out?
Dim MainLB As String = NomLB.Replace("Nominal", "")
Reports_BalanceSheet_ListBox_IndexChanged(MainLB, NomLB, DT)
and that runs
Private Sub Reports_BalanceSheet_ListBox_IndexChanged(ByVal MainLB As String, ByVal NominalLB As String, ByVal NomDT As DataTable)
Try
Dim LB As ListBox = Reports_BalanceSheet_Grid.FindName(MainLB)
If LB.SelectedIndex = -1 Then
Exit Sub
End If
Dim NomLB As ListBox = Reports_BalanceSheet_Grid.FindName(NominalLB)
If NomLB Is Nothing Then
Exit Sub
End If
If LB.SelectedValue Is Nothing Then
Exit Sub
End If
If LB.SelectedValue.GetType.Name Is Nothing Then
Exit Sub
End If
If LB.SelectedValue.GetType.Name <> "DataRowView" Then
Dim CatID As Integer = LB.SelectedValue
Dim DT As DataTable = NomDT.Copy()
Dim vDV As New DataView(DT)
vDV.RowFilter = "CatID = " & CatID & " AND FormID = " & FormID
vDV.Sort = "Position"
DT = vDV.ToTable
vDV = Nothing
With NomLB
.ItemsSource = DT.DefaultView
.SelectedValuePath = "ID"
.DisplayMemberPath = "NomName"
.Items.Refresh()
End With
End If
Catch ex As Exception
EmailError(ex)
End Try
End Sub