Hmm. I left my pda with the testers today, but as far as I remeber, CComboBox'es doesnt automatically do autocomplete in the edit box, they do it in the small popup window over the SIP. Maybe this is a feature in your program, or maybe Im just remembering it wrong? Anyway, to disable the autocompletion that the SIP offers (handy on PPC 2000's since they do it for editboxes with ES_PASSWORD too) do this: SIPINFO info; SHSipInfo(SPI_GETSIPINFO, 0, &info, 0); info.fdwFlags |= SIPF_DISABLECOMPLETION; SHSipInfo(SPI_SETSIPINFO, 0, &info, 0); SHSipPreference(m_hWnd, SIP_FORCEDOWN); SHSipPreference(m_hWnd, SIP_UP); And to turn it back on: SIPINFO info; SHSipInfo(SPI_GETSIPINFO, 0, &info, 0); info.fdwFlags &= ~SIPF_DISABLECOMPLETION; SHSipInfo(SPI_SETSIPINFO, 0, &info, 0); “Our solar system is Jupiter and a bunch of junk” - Charley Lineweaver 2002