Edit: I\'ve updated the code below so that it now works, thanks to Rob\'s answer.
I\'ve found a couple of pages that show how to do this (http://www
I don't use DTF (all natural C++ CustomActions for me) but Record's are 1 based. Have you tried shifting all of your SetRecord() calls over by one index?
Also, the .wxs code above seems to suggest that you are using "DUMMYPROPERTY" as the control Property for the ComboBox not "IIS_WEBSITENAME" like the .cs code is using.