Hi Werner,
yes the builder is not made to work for Tracher canvas and Trachel shapes because in a builder we use methods that can be understood by an RTView and RTShape etc.
Why don't you use an RTView and RTBox ? so you can use directly the builder with view elements as objects ?
I am not sure to understand your problem because to me you can always create any desired boxes using�� RTBox new width:y; height:x then place them with #translateTo: or #translateBy:
It would be much more interesting as you can then treat your objects elements in the view with their model contents and not only shapes in an TRCanvas.
Pierre