CBN_SELCHANGE

void CDlgLayout::OnSelchangeComboPanelSlot()
{
 //TODO: Add your control notification handler code here
 CString csPanelIndex;
 int iPanelIndex = 0;
 int nSel = ((CComboBox*)GetDlgItem(IDC_COMBO_PANEL_SLOT))->GetCurSel();
 if (-1 != nSel)
 {
  ((CComboBox*)GetDlgItem(IDC_COMBO_PANEL_SLOT))->GetLBText(nSel, csPanelIndex);
 }
 //这个方法不行
    //GetDlgItemText(IDC_COMBO_PANEL_SLOT,csPanelIndex);

}