For those using the ALSO function: this is a significantly different and much more automatic and complete method how to achieve a similar effect, in my opinion.
Still a lot of work to be done. Anyway.. the system is not meant to be used only on Rebol... I was using some its predecessors to build other projects too... but Rebol is a little bit different with its high use of generated code.
Red GUI provides the native OS gfx elements. But there are cases, where custom widgets might be a better fit. Welcome Red Spaces, a prototype library of a cross-platform draw based widgets ....