看看这段程序

[denal]

m_hWnd = CreateWindow(FLOATING_VIDEO_CLASS, _T("helptrain"), WS_POPUP|WS_CAPTION,
0, 0, 190, 178, NULL, NULL, hInst, NULL);

ShowWindow(m_hWnd,SW_SHOW);
SetWindowPos(m_hWnd,HWND_TOPMOST,0,0,190,178,SWP_NOMOVE|SWP_SHOWWINDOW);

HWND handle_combo=CreateWindow(_T("combobox"),
_T("combo1"),
NULL,
0,0,200,20,
NULL,NULL,
hInst,NULL);
ShowWindow(handle_combo,SW_SHOW);

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然后我应该怎么写比如，怎么增加item，怎样捕获点击事件。