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Hello friends,please I have this code:
HTML
<DataGrid Name="dgvArticulos"  Width="450" Height="350" AutoGenerateColumns="False" CanUserAddRows="False" >
    <DataGrid.Columns>
           <DataGridTemplateColumn Header="Unidad Medida" Width="100">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <ComboBox  ItemsSource="{Binding ListaUnidades}" SelectedValuePath="Codigo" DisplayMemberPath="Descripcion" SelectedIndex="0" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTextColumn Header="Descripcion" Binding="{Binding Descripcion}" Width="300"  IsReadOnly="True"/>
    </DataGrid.Columns>
</DataGrid>

And this is my code,it work well :
C#
public partial class MainWindow : Window
    {
        public class UMedida
        {
            public int Codigo { get; set; }
            public String Descripcion { get; set; }
        }
        public  class CProductos
        {
            public int ID { get; set; }
            public String Descripcion { get; set; }
            public List<UMedida> ListaUnidades { get; set; }
        }
        public ObservableCollection<CProductos> ListaProductos;

        public MainWindow()
        {
            ListaProductos = new ObservableCollection<CProductos>() 
                {
                new CProductos{ ID=3, Descripcion="Producto Uno",ListaUnidades= new List<UMedida>{ new UMedida{Codigo=1,Descripcion="Unidad"},new UMedida{Codigo=1,Descripcion="Pkg x6"}}},

            this.DataContext = ListaProductos;
            InitializeComponent();
            dgvArticulos.ItemsSource = ListaProductos;
        }

What I try to do is when the user selects a row I need to know what unit of measure is assigned a certain article
C#
private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            CProductos prod = (CProductos)dgvArticulos.SelectedItem;
            prod.ListaUnidades // help me please
        }
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