Right now I don't have time to really dig into the wx tools. My first impression is that the tools *seem* use an extension or library that has different commands and different syntax than Lua, so at this point I am not convinced it will be the nirvana that is has been described as. I have only a tiny bit of experience with it at this point, but in general, I find it can be frustrating to bounce back and forth between languages and wxFormBuilder sort of forces that on you even though everything is in 'Lua' . . . . supposedly.
If you need to make a lot of forms and you bounce back and forth between the several languages that are supported, then undoubtedly having a single tool to kick out code in each language would definitely be a significant time saver. For example if I needed a 'form' in C++ that is identical or very similar to one that I already did in Lua, and if that can be loaded into wxFormBuilder and simply regenerated in another language . . badda bing!
Terry, speaking of forms, what is the status of your wizard. You were going to attack treading next and you were going to give me a sample to play with.