M_hWindow is a handle to the parent window hWindow is to create the child window handle, so got after child Windows embedded is embedded, but once the child window button elements so as to obtain the focus in the child window will run, what point to the mouse button, or other elements on the child window will move, how is this to return a responsibility excuse me ah, if parent window is not set as a transparent window, child window will not show, invisible, but with the mouse to drag the title bar is a window to it, how to return a responsibility??