要在菜单项中添加/删除检查，请为该菜单项添加OnUpdatexxx()处理函数.

CCmdUI [

To add/remove a check in a menu item, you add an OnUpdatexxx() handler for that menu item.

The CCmdUI[^] instance handed to you can be used for this.

Something like:

void CMyFrame::OnUpdateShowMyToolbar(CCmdUI *pCmdUI)
{
    pCmdUI->SetCheck(IsMyToolbarVisible() ? 0 : 1);
}