If you want ON_UPDATE_COMMAND_UI handlers to work for the control bars, you also need to derive new control bar classes and handle the WM_IDLEUPDATECMDUI message.

• 如果希望ON_UPDATE_COMMAND_UI处理程序适用于控制条,还需要派生新控制条类并处理WM_IDLEUPDATECMDUI消息。