当使用者采取某项动作来变更焦点或关闭视窗时，焦点便会从启动的应用程序视窗移出。
Focus moves away from the activated application window when the user takes some action to change the focus or close the window.
自订控制项的主机是控制项本身的HWND，而非是应用程序视窗或任何其他可能包含最上层控制项群组的视窗。
The host of a custom control is the HWND of the control itself, not the application window or any other window that might contain groups of top-level controls.
要编辑，就需要启动内置的视窗注册编辑程序。
To edit it, you need to run the built-in Windows Registry editor.
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