HRESULT IOleInPlaceSite.OnInPlaceActivate() { Debug.WriteLineIf(AxHTraceSwitch.TraceVerbose, "in OnInPlaceActivate"); host.SetAxState(AxHost.ownDisposing, false); host.SetAxState(AxHost.rejectSelection, false); host.SetOcState(OC_INPLACE); return(HRESULT.S_OK); }