Changing the check status of a menu item

[CrazyPlaya]

Hi at all,

i have a SDI Applikation made by MFC. I want to change the check status of one Menu Item.
Ho can I do that?

I´ve tried this:
Adding the Command Event Handler

void MyClass::CommandHandler()
{
      MENUITEMINFOW mItemInfo;
    CWnd* pMainWnd = AfxGetMainWnd(); 
    CMenu *mMenu = pMainWnd->GetMenu();
    CMenu *mSubMenu = mMenu->GetSubMenu(0);
    mSubMenu->GetMenuItemInfo(ID_CONFIGURE_SETTOFOREGROUNDININCOMINGCALL, &mItemInfo);
    if(mItemInfo.fState == MF_CHECKED)
    {
        mSubMenu->CheckMenuItem(ID_CONFIGURE_SETTOFOREGROUNDININCOMINGCALL, MF_UNCHECKED);
        m_bSetForeground = false;
    }
    else if(mItemInfo.fState == MF_UNCHECKED)
    {
        mSubMenu->CheckMenuItem(ID_CONFIGURE_SETTOFOREGROUNDININCOMINGCALL, MF_CHECKED);
        m_bSetForeground = true;
    }
}

This doesn´t work.
Is there a way to do it with the ON_UPDATE_COMMAND_UI?
But I don´t know how I can get the state of the menu item entry and if I do it with this handler
everytime since I click the Menuheader without clicking the wanted item the function will be executed and I can´t find out how to catch only if i click my item.

Regards
Karsten