nesting wpf datagrid inside row details template binding example

Hi Guys,

I normally bind my datagrids through the following method:

C#:

	    smb1 = new DataTable();

	    smb1.Columns.Add("DESCRIPTION", typeof(string));
            smb1.Columns.Add("DESCRIPTION_STATUS", typeof(string));
            smb1.Columns.Add("DATE", typeof(DateTime));
            smb1.Columns.Add("PERIOD", typeof(string));
            smb1.Columns.Add("MACHINE", typeof(string));

            smb1.Rows.Add("PRODUCT", result, DateTime.Now, "David", "SMB1");
            smb1.Rows.Add("PRODUCT NUMBER", result2, DateTime.Now, "David", "SMB1");
            smb1.Rows.Add("BATCH NUMBER", "Enebrel", DateTime.Now, "Sam", "SMB1");

            SMB1.ItemsSource = smb1.DefaultView;

XAML:

<DataGrid Name="SMB1" ItemsSource="{Binding}" CanUserAddRows="False">

I would like to create a nested datagrid using the same type of C# code but with the data bound to a different datatable.

I think the XAMLS would be the same as below:

<DataGrid Name="SMB1" ItemsSource="{Binding}" AutoGenerateColumns="False" CanUserAddRows="False"><DataGrid.Columns><DataGridTemplateColumn Header="Datagrid" Width="*"><DataGridTemplateColumn.CellTemplate><DataTemplate ><DataGrid Name="data2" ItemsSource="{Binding}" CanUserAddRows="False"  /></DataTemplate></DataGridTemplateColumn.CellTemplate></DataGridTemplateColumn></DataGrid.Columns></DataGrid>

but I cannot figure out how to bind to this second datagrid. I would like to use the same approach or one as close as possible to it. I don't think I can use the static approach as the data can be changed by the use of a datetimepicker once the application has been loaded up. Can anyone show me what my options are with a simple example please as I have spent the best part of a week studying this and have gone through most if not all the examples l could find on the internet but to no avail.

thanks Callum