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SendDlgItemMessage   Send Message To Dialog Box Control

SendDlgItemMessage(hDlg, nIDDlgItem, wMsg, wParam, lParam)
HDLG hDlg;
int nIDDlgItem;
unsigned wMsg;
WORD wParam;
long lParam;

Returns:        Value returned by control's window function or zero if
                control ID is invalid.

Note:           This is the same as SendMessage(GetDlgItem(hDlg, nID)...