iusse for thirdparty software and CXTPControlCombo

Hello Sir,

             I install a thirdparty IME software in my OS. The thirdparty software download URL is
             http://myweb.hinet.net/home10/mason2004/Going8_Professional.exe.
             The thirdparty IME is received a return key to type key words to Edit control or Combobox control...etc.
             if i used a CXTPControlComboBox object in my GUI, that the thirdparty IME can not working to type key words to CXTPControlComboBox object.
             if i used a function(SetEditStyle(ES_WANTRETURN)) for CXTPControlComboBox object, that the thirdparty IME can working in first time.
             Next time , I type some key words to CXTPControlComboBox object again. The IME can not working.        
             Do you have some suggestions for me? Thank you for you help!