Plz~ help me (combo-control)

I created combo-control on commandbar;
and inserted items to combo-control.
 
but, I don't know how recevice event of combo-control.
item-changed or item-clieked ....
 
help me~~
 
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CXTPToolBar* pNCControlToolbar = (CXTPToolBar*) pCommandBars-Add(_T("ncControlToolbar"), xtpBarTop);
  pNCControlToolbar->SetBarID(IDR_TOOLBAR_NC02);
  CXTPControlComboBox* pControlCombo = (CXTPControlComboBox*)pNCControlToolbar->GetControls()->Add(xtpControlComboBox, ID_NCCOMBO01);
  pControlCombo->SetWidth(130);
  pControlCombo->SetDropDownListStyle();
  pControlCombo->AddString(_T("0"));
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Spy++ can't catch event anything to changing item.
 
Just i wanna know same thing CBN_SELCHANGE or CBN_EDITCHANGE(originally visual C++'s combo box event)