I am trying to write a second ComboBox, dependent on the selection of the first. How do I reference the text from the first box?

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MFC

Code and values from the first box:

CComboBox* pComboBox = (CComboBox*)GetDlgItem(IDC_AXIS_TYPE1);
pComboBox->AddString(_T("AVP"));
pComboBox->AddString(_T("GSI"));
pComboBox->AddString(_T("GSR"));
pComboBox->AddString(_T("LE"));
pComboBox->AddString(_T("LP"));

I want to be able to select a value from this menu and be able to use it to bring up different sets of values for the next combo box. Getting text out to use in the next statement seems to be my problem.