I need to save the state of the grouping of a WinGrid in my form.

So I save the grouping orders in the Database, and then, when (re)loading my inherited UltraWinGrid, i do the following:

      If Me.DisplayLayout.Bands.Count > 0 Then
        Me.DisplayLayout.Bands(0).ResetSortedColumns()
 
        For Each strColName As String In objGroupByColumnDictionary.Values
          Me.DisplayLayout.Bands(0).SortedColumns.Add(strColName, False, True)
        Next strColName
      End If

This code works... but for a single group column (!?) When I have multiple columns only the last added column is displayed in the groups....

How to fix it?

Update:

The code above was used in the Form's Constructor.

I need to "refresh" in after the form was displayed, to make it work like is should:

Private Sub SelectionAvancee_Shown(sender As Object, e As System.EventArgs) Handles Me.Shown
Me.ReloadResultGroupByColumns()
End Sub

Private Sub ReloadResultGroupByColumns()
'' reinitialise sortedColumns
Dim sortedColumns As New List(Of String)
For Each col As Infragistics.Win.UltraWinGrid.UltraGridColumn In grdResult.DisplayLayout.Bands(0).SortedColumns
sortedColumns.Add(col.Key)
Next col
grdResult.DisplayLayout.Bands(0).ResetSortedColumns()
For Each colKey As String In sortedColumns
grdResult.DisplayLayout.Bands(0).SortedColumns.Add(colKey, False, True)
Next colKey
''''
End Sub