How to Binding combox in dataGrid?

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WPF

I bind combox column in the Datagrid

DataGridTemplateColumn textColumn = new DataGridTemplateColumn();
          textColumn.Header = header;
          textColumn.Width = DataGridLength.Auto;
          DataTemplate dts = new DataTemplate();
          FrameworkElementFactory fc = new FrameworkElementFactory(typeof(ComboBox));
          //  Binding b = new Binding("ComboxClass");
          Binding b = new Binding(field);
          b.Mode = BindingMode.TwoWay;
          b.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
          fc.SetBinding(ComboBox.ItemsSourceProperty, b);
          // fc.SetValue(ComboBox.DisplayMemberPathProperty, "PriceTypeValue");
          // fc.SetValue(ComboBox.SelectedValueProperty, "PriceTypeId");
          fc.SetValue(ComboBox.DisplayMemberPathProperty, displayMemberPathProperty);
          fc.SetValue(ComboBox.SelectedValueProperty, selectedValueProperty);
          fc.SetValue(ComboBox.SelectedIndexProperty, 0);
          fc.SetValue(ComboBox.WidthProperty, 100.0);

          dts.VisualTree = (fc);

          textColumn.CellTemplate = dts;
          dgForData.Columns.Add(textColumn);

Began to appear normal, when the data more when I scroll down, find combox default selectIndex = 0 data not see (the content is combox empty)

Asked the teacher pointing

Want to ask a question, how do I DataGridComboBoxColumn dynamic binding in code, I can not find accurate information