private void trvChucNang_SelectedNodeChanging(object sender, RadTreeViewCancelEventArgs e) { e.Cancel = true; var tag = e.Node.Tag; if (tag == null) { return; } string tabTag = ""; BaseControl.ControlBase control = null; switch (tag.ToString()) { case "Add": tabTag = "addNhanSu"; control = new NhanSu.ctrlThemMoi(); break; case "Edit": break; case "Delete": break; case "Contract": break; case "Education": break; case "Family": break; } AddPageToTab(tabTag, control); }