VAssistX 10.5 doesn't support auto suggestions for C++ __interface types (more info on __interface at http://msdn.microsoft.com/en-us/library/50h7kwtb.aspx. I'm pretty sure this was working when I had 10.0 and it works with the VS built in auto-suggestions. I just installed 10.5.1715.0 and it still isn't working.