Textbox handler in wpf

See more:

C#

WPF

This is my code.... i am facing problem with text box handler... problem with handler is that when i am try to enter any value in text box it is automatically event is calling for first key press only.... So is there any other event which allows user to enter data into text box an then the event should call like "On Blur"???? If anyone can do please help me bye providing code....Code is done everything dynamically no xaml is used

private void CreateDynamicGridView(DataSet dsBillingDetails)
       {

          // Create a GridView
           int rowPosition = 0;
           for (int index = 1; index < dsBillingDetails.Tables.Count; index++)
           {

                   DataGrid grdCharges = new DataGrid();
                   grdCharges.ItemsSource = dsBillingDetails.Tables[index].DefaultView;
                   grdCharges.AutoGenerateColumns = false;

                   Style grdHeaderStyle = this.FindResource("grdHeaderStyle") as Style;

                   <big>//Adding Button Dynamically</big>
                   DataGridTemplateColumn dgtcDel = new DataGridTemplateColumn();
                   FrameworkElementFactory fefDelButton = new FrameworkElementFactory(typeof(Button));
                   BitmapImage biDeleteIcon = new BitmapImage();

                   fefDelButton.SetBinding(Button.TagProperty, new Binding("LineItemID"));
                   fefDelButton.AddHandler(FrameworkElement.MouseLeftButtonDownEvent, new MouseButtonEventHandler(btnDelete_Click), true);
                   DataTemplate buttonTemplate = new DataTemplate();

                   dgtcDel.Header = "D";
                   dgtcDel.HeaderStyle = grdHeaderStyle;
                   buttonTemplate.VisualTree = fefDelButton;
                   dgtcDel.CellTemplate = buttonTemplate;
                   biDeleteIcon.BeginInit();
                   biDeleteIcon.UriSource = new Uri(@"..\Images\Deleteicon.png", UriKind.Relative);
                   biDeleteIcon.EndInit();

                   fefDelButton.SetValue(Image.SourceProperty, biDeleteIcon);
                   fefDelButton.SetValue(Image.VisibilityProperty, Visibility.Visible);
                   grdCharges.Columns.Add(dgtcDel);

                   //create a template column for text box
                   DataGridTemplateColumn dgtTextBox = new DataGridTemplateColumn();

                   //set title of column
                   dgtTextBox.Header = "Line Item Units";
                   dgtTextBox.Width = 150;

                   DataTemplate dtTextBox = new DataTemplate();
                   FrameworkElementFactory fefTextBox = new FrameworkElementFactory(typeof(System.Windows.Controls.TextBox));

              //<big>Adding Hanler THIS IS THE ISSUE</big>
                 fefTextBox.AddHandler(TextBox.TextChangedEvent, new TextChangedEventHandler(txtUnitCount_Changed));
                   dtTextBox.VisualTree = fefTextBox;
                   dgtTextBox.CellTemplate = dtTextBox;
                   grdCharges.Columns.Add(dgtTextBox);

                   grdBillingDetails.Children.Add(grdCharges);

                   //   grdCharges.Style = grdHeaderStyle;
                   Grid.SetRow(grdCharges, rowPosition + 1);
                   rowPosition = rowPosition + 2;
               }
       }