combo-box editing

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C++

If I select a string from the drop down list of my combo-box that string is placed into the appropriate edit box and is highlighted (as expected). However, if I then decide to type my own string into the edit box, the first character I type replaces the existing highlighted string and the cursor jumps back to the starting position so that all subsequent typed characters precede the first. (e.g. If I type DC-10 what I get is C-10D). I suspect it has something to do with the focus created by the drop down select but why the cursor jump?

Thanks.


Here is some code to look at:

ON_CBN_SELCHANGE(IDC_F4, OnSelChangeCombo)
    ON_CBN_EDITCHANGE(IDC_F4, OnSelChangeEditC)

void CTab::OnSelChangeCombo()
{
    int m;

    UpdateData(true);

    m = ((CComboBox *) GetDlgItem(IDC_F4))->GetCurSel();
    if(m >= 0)
        ((CComboBox *) GetDlgItem(IDC_F4))->GetLBText(m, m_szETF4);
    else
        m_szETF4.Empty();

    UpdateData(FALSE);
}

void CElecTab::OnSelChangeEditC()
{
    int     m;
    CString last4;

    last4 = m_szETF4;

    UpdateData(true);

    if(!m_szETF4.IsEmpty() && m_szETF4 != last4)
    {
        if((m = ((CComboBox *) GetDlgItem(IDC_F4))->FindStringExact(-1, last4)) != CB_ERR)
            ((CComboBox *) GetDlgItem(IDC_F4))->DeleteString(m);

        ((CComboBox *) GetDlgItem(IDC_F4))->AddString(m_szETF4);
    }

    UpdateData(FALSE);
}