Sorry, I don't use Windows. Chances are very good, however, that Notepad++ doesn't support this style of code completion. The new stuff I've added requires a full IDE that can parse all of the files and build a database of options.
NB 6.8 just added rudimentary support for PHPDocs, so the huge block of @param and @method items at the top give it hints into which magic methods and fields exist on the DataMapper object. I'm pretty sure I read that Eclipse with the new PHP plugin can do it, and ZendStudio may as well.
Text-editor style programs almost never can do it, because they need to be able to see the entire project to provide information.
