How to select an item in combobox of another application.

I write an application to select the items in the combobox of  another application.
I got window handle for Combobox and I sent.
sendmessage(ghwndCombo, WM_LBUTTONDOWN, 0, 0);
  sendmessage(ghwndCombo, WM_LBUTTONUP, 0, 0);
Then, I can see a list of items in combobox but I can not select the item that I want to. How to select an item in combobox?. What parameter to pass in Sentmessage function?.
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vorisekConnect With a Mentor Commented:
An application sends a CB_SETCURSEL message to select a string in the list of a combo box:

wParam = (WPARAM) index;  // item index
lParam = 0;               // not used;

sendmessage(ghwndCombo, CB_SETCURSEL, index, 0)

You can also use CB_SELECTSTRING to select defined string.
SutteeAuthor Commented:
Adjusted points from 50 to 60
SutteeAuthor Commented:
Adjusted points from 60 to 100

hWnd: HWND;  //handle to a window
Msg: UINT; //the identifier of the msg. to send
wParam:WPARAM; //32bit msg value
lParam: LPARAM; //32bit msg value
lpResultCallBack:TFNSendAsyncProc; //pointer to an app-defined callback procedure
dwData:DWORD //app defined value
); BOOL  // returns true or false

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