it would be nice if the resource bar could get a page, even though it is not really complex yet; a complete interface documentation is always nice for newbies.
after that, you could pick two or three objects like the list, imagelist, listbox etc. whose use is not that apparent to newbies (like me) - it is rather hard to figure out what (and how) exactly they are doing by looking at their conditions & actions. maybe some of these objects are similar to one another, so that a doc page for one of them already helps figuring out the other ones (and you don't have to exhaust yourself in writing docs ;).
apart from those strange gui-mechanic-objects (that is actually a guess at what they do) like imagelist etc there is also the question on reading/writing files, since every object that can do that seems to do it differently ...