check focus

i have edit boxes and combo boxes on a dialog (edit and combo boxes
made by creat comand through widgt). i overloaded keyboard, i am using
up and down keys for inserting new edit and combo boxes. now i want to
check the focus if arrow key will pressed , i dont want to run my
function when focus is with combo box.

overloaded function is :

BOOL sdialog::PreTranslateMessage(MSG* pMsg)
{
    // TODO: Add your specialized code here and/or call the base class
    if(pMsg->message==WM_KEYDOWN)
    {
        //if(pMsg->wParam==VK_RETURN)
         // pMsg->wParam=VK_TAB;
//
        if(pMsg->wParam==VK_UP)
        {
        //MessageBox("hello");
    Onprevious();

        }
    /////////////////////////////
        else
        if(pMsg->wParam==VK_DOWN)
        {
            if(count!=checkforbox)
            OnNext();

        }// down
////////////////////////////////
        else
        if(pMsg->wParam==VK_DELETE)
        {
            Ondeleterow();

        }// delete
//////////////////////////////////////
        else
        if(pMsg->wParam==VK_RETURN)
        {
            pMsg->wParam=VK_F5;

        }// enter
//////////////////////////////////////
        else
        if(pMsg->wParam==VK_ESCAPE)
        {

            OnButton2();

        }// enter
//////////////////////////////////////
        if(pMsg->wParam==VK_F5)
        {
    if(count==checkforbox)
            OnNext();
        }// enter

    } // keydown

    return CDialog::PreTranslateMessage(pMsg);
}

plz help me in detail.