大师：请问动态增加的窗口中的按钮菜单项目，如何能显示选中状态？通过
Checked属性设置无效？
Dim Strip As WinForm.Strip = e.Form.Strips("工具栏")
Strip.Items.Clear
For Each zf As String In dgxmjh
Strip.Items.Add(zf, zf, "", StripItemTypeEnum.Button)
Next
For Each sit As WinForm.StripItem In e.Form.Strips("工作底稿工具栏").Items
sit.Checked = True
sit.DisplayText = True
Next