How to know Ctrl + F is pressed on Keyboard?

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C++

MFC

Here is the function i have:

BOOL cDlgGrid::PreTranslateMessage(MSG* pMsg) 
{ 
    if (WM_KEYFIRST <= pMsg->message && 
        pMsg->message <= WM_KEYLAST) 
    { 
        HACCEL hAccel = m_hAccel; 
        if (hAccel && 
			::TranslateAccelerator(m_hWnd, hAccel, pMsg)) 
            return TRUE; 
    } 
    if (pMsg->message==WM_KEYDOWN && pMsg->wParam == VK_CONTROL)
    {
         OnFind(); // implements and find dialog
    }
    return CDialog::PreTranslateMessage(pMsg); 
};

According to the code, i know how to capture the Ctrl key press, now how do i know if Ctrl+F is pressed, i want to implement the find dialog for Ctrl+F not for just Ctrl. How do i achieve this?