If you create a message box while a dialog box is present, use a handle to the dialog box as the hWnd parameter.
如果在一个对话框出现时你创建一个消息框，使用对话框的句柄作为参数。
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.
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。
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