How to bind the combo box inside the DataGrid.RowDetailsTemplate

Hi,

    I have a data grid which has RowDetails.Template. In that i have another grid which will have the combo box that will bind data from a service. But that combo box is not binded and it is not populating. Please find the sample code below and help me out.

xaml:
===========

             ItemsSource="{Binding}"  VerticalAlignment="Stretch" HorizontalAlignment="Stretch" MinHeight="250" >
    
       
           
           
           
           
           
           





               
                   
                       
                           
                       
                       
                           
                               
                                   
                                       
                                           
                                               
                                           
                                       
                                   
                               
                           
                       
                   
               
           


xaml.cs
===========

  private void cmb1Loaded(object sender, RoutedEventArgs e)
        {
            ComboBox ComboBox1 = new ComboBox();
            ComboBox1.ItemsSource = objStage;
        }

 private void dgSilverligh_Inner_LoadingRow(object sender, DataGridRowEventArgs e)
        {
            DataGrid dg = (DataGrid)sender;
            ComboBox cmb1 = dg.Columns[0].GetCellContent(e.Row) as ComboBox;
            cmb1.ItemsSource = objStage;
            cmb1.SelectedIndex = 0;
}

Thanks,
Vijay