2.如何给菜单加上选中标记

[xintiaf]

我使用下面的程序，IDR_POPUP_TRAY 是托盘菜单，ID_TRAY_PLAY是其中的
一项，可这段程序根本不起作用，不知道为何函数能正确返回上一状态(UNCHECKED),
可就是没有预期的效果(选不中!)可我在OnInitDialog里加上
pSysMenu->CheckMenuItem(IDM_ABOUTBOX, MF_BYCOMMAND|MF_CHECKED);
他就好使，我晕：） 请哥们帮忙侃侃呗~~ 难道动态弹出的菜单不能这样操作？

/////////////////////////////
//这段程序不好使，咋回事呢？
CMenu CheckMenu, *pSubMenu;
if(!CheckMenu.LoadMenu(IDR_POPUP_TRAY))
return ;
if ((pSubMenu =CheckMenu.GetSubMenu(0)))
{
if(pSubMenu->CheckMenuItem(ID_TRAY_PLAY,
MF_BYCOMMAND|MF_CHECKED)==MF_UNCHECKED)
AfxMessageBox("laststate：unchecked");
}
else
AfxMessageBox("load error");

[zhazhahuhu]

A pop-up menu item must be checked by position

[zhazhahuhu]

In MSDN,the following information is given:
UINT CheckMenuItem( UINT nIDCheckItem, UINT nCheck );

The nIDCheckItem parameter may identify a pop-up menu item as well as a menu item. No special steps are required to check a pop-up menu item. Top-level menu items cannot be checked. A pop-up menu item must be checked by position since it does not have a menu-item identifier associated with it.