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.
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.
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