Hello,
I don’t know if that interest somebody 
but Ruiby DSL become
more mature, so pass to 1.0 version !
Gem :
Ruiby | RubyGems.org | your community gem host
Code:
GitHub - glurp/dsl-gtk: DSL for make a simple ruby GUI application
Doc Reference, with exemples :
Ruiby DSL doc
changes:
- Composition checking : check DSL ‘syntaxe’,
- Plot, Canvas, toolbar,… refactorized for to be more ‘closurified’
- Data Variable (DynVar) : binding for entry/slider/check_button
- Object data binding : Struct like, composed of DynVar
- Stock DynVar and DynObject : data persistence to file on exit
- better test (77% coverage)