[tde-devels] Designing UI

I have yet another question about TDE development: how do I design UI components? Back in the days, I vaguely recall QtCreator was intended for that task, but now I don't think it supports old Qt version used by TDE. I see that UI elements are sourced from the .ui files, which are essentially xml. I imagine that with enough determination I can work by simply modifying those files, but I don't think this is the best way of doing things. So, is there a WYSIWYG editor for developing TDE UI?

Cheers, Janek