Text entered in WPF DatagridTextboxColumn and value selected in DatagridComboboxColumn are not displayed when focus is lost

Question

My question might seem repeatetive as there are similar questions in StackOverflow like,

https://stackoverflow.com/questions/5733782/how-to-retain-value-in-datagridcomboboxcolumn-of-wpfs-datagrid

https://stackoverflow.com/questions/6101441/creating-wpf-datagrid-dynamically-with-dynamically-created-drop-down-box-using-d

but I cudn't find an answer pertaining to my requirements.

I generate a WPF datagrid dynamically which takes columns from a metadata file(excel) based on certain conditions. The datagrid needs to be generic and hence I cannot bind the Datagrid itself during creation. I bind the DatagridCombobobox columns dynamically and was able to get the values in them too.

Now my problem is, once I select a value in the DatagridCombobobox or enter text in the DatagridTextboxColumn and then move to another cell/ row, this text and selection disappears.

How do I enable the Datagrid cell/row to remember my entered text or selection dynamically? I checked the answer of a similar question in DataGridComboBoxColumn cell not displaying selected item text? but it is for a static datagrid. Since my datagrid creation is dynamic, I donot know how to use this solution. Kindly help. I am stuck up in this and its taking a lot of my time :(

Regards, Niranjan.

Dynamic DataGrid creation:

    Dim setupGrid = "<my:DataGrid AutoGenerateColumns='False' Name='grdSetup' " & "xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'" & "  xmlns:sdk = 'http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk'" & "  xmlns:x = 'http://schemas.microsoft.com/winfx/2006/xaml'" & "  xmlns:TAB = 'http://fabtab.codeplex.com'" & "   xmlns:my='http://schemas.microsoft.com/wpf/2008/toolkit' " & " >"
    setupGrid = setupGrid & "<my:DataGrid.Columns>"
    ...
    ...
    ...
    setupGrid = setupGrid & "</my:DataGrid.Columns>"

    setupGrid = setupGrid & "</my:DataGrid>"

    Dim sr = New MemoryStream(Encoding.ASCII.GetBytes(setupGrid))
    Dim pc = New ParserContext()
    pc.XmlnsDictionary.Add("", "http://schemas.microsoft.com/winfx/2006/xaml/presentation")
    pc.XmlnsDictionary.Add("x", "http://schemas.microsoft.com/winfx/2006/xaml")
    Dim grdElement As UIElement = DirectCast(System.Windows.Markup.XamlReader.Load(sr, pc), UIElement)
    Dim grdSetup As DataGrid = DirectCast(grdElement, DataGrid)

My DataGridCombobox code is similar :

    setupGrid = setupGrid & "<my:DataGridComboBoxColumn x:Name='" & dr.Item("ParameterName").ToString.Trim & "'  Header='" & dr.Item("ParameterName") & "'  SelectedValuePath='" & dr.Item("ValueColumn") & "' DisplayMemberPath='" & dr.Item("DisplayColumn") & "'  />"

This string value will be added to the above DataGrid string and converted to UIElement as shown in the above DataGrid code. I add my Datagrid to an ItemsControl dynamically :

    Me.DynamicContent.Items.Add(grdElement)

where DynamicContent is ItemsControl.

In the UserControl_Loaded event, I find each ComboBox in my Datagrid thru :

    Dim dynamicGrid as DataGrid = DynamicContent.ItemContainerGenerator.ContainerFromIndex(0)
    Dim comboColumns = dynamicGrid.Columns.OfType(Of DataGridComboBoxColumn)()
    For index As Integer = 0 To comboColumns.Count - 1
     comboColumns(index).ItemsSource = DirectCast(dt, IListSource).GetList()
    Next

where dt is a Datatable which consists of data to be to my ComboBox. It has the SelectedValuePath and DisplayMember path of the combobox as the columns.

I cannot set the SelectedItemBinding and the SelectedValueBinding for the DatagridComboboxColumn before hand as it is dynamic and varies for different ComboColumns. I dont know how these can be set in the above loaded event. Pls let me know what I am doing wrong? Or what can be done so that I can be able to retain the values even after the focus is lost. Sorry for the lengthy description :(