设置Combobox列选择的值

Question

GridViewComboBoxColumn Currency = (GridViewComboBoxColumn)dgv_AddJournal.Columns["Currencry"];
Currency.DataSource = ListCurency;
Currency.DisplayMember = "NameArabic";
Currency.ValueMember = "ID";

如何设置选定值RadGrid我在页面加载

中找不到Currency.SelectedValue