Data Binding

Hi!

I have a problem with databinding. I made 2 datagrid. The 1st is a general WPF dagrid the 2nd is dxgrid control.
Both show the datas through entity framework.
I wanted to bind a current row to a texbox. If I click the row in a 1st table is working well and the data is showing in the textbox, but in the 2nd grid control not working.
What cause the problem?

This is the XAML code:

  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="MainWindow" Height="685" Width="895" Loaded="Window_Loaded" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:my="clr-namespace:Valinor" xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid">
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 


This is a c# code:

  public partial class MainWindow : Window
  {

  public MainWindow()
  {
  InitializeComponent();
  }

  private void Window_Loaded(object sender, RoutedEventArgs e)
  {
  Valinor.ValinorEntities valinorEntities = new Valinor.ValinorEntities();
  System.Windows.Data.CollectionViewSource itemsViewSource = ((System.Windows.Data.CollectionViewSource)(this.FindResource("itemsViewSource")));
  System.Data.Objects.ObjectQuery itemsQuery = this.GetitemsQuery(valinorEntities);
  itemsViewSource.Source = itemsQuery.Execute(System.Data.Objects.MergeOption.AppendOnly);
  }

  private System.Data.Objects.ObjectQuery GetitemsQuery(ValinorEntities valinorEntities)
  {
  System.Data.Objects.ObjectQuery itemsQuery = valinorEntities.items;
  return itemsQuery;
  }
  }