GetEditCtrl()->GetWindowText crash

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   It could be that the combo box is a drop list in that case it would not have an edit control.  You might want to try something like this:

CXTPControls* pXTPControls = m_myWndToolBar.GetControls();
if (pXTPControls)
    return false;

CXTPControlComboBox* pXTPComboBox =(CXTPControlComboBox*)pXTPControls ->FindControl(ID_ZOOM);
if (!pXTPComboBox)
    return false;

CString strZoom;
CXTPControlComboBoxEditCtrl* pXTPEdit = pXTPComboBox->GetEditCtrl();
if (pXTPEdit)
    strZoom = pXTPComboBox->GetEditText();
else
    strZoom = pXTPComboBox->GetListBoxText();