thanks for answer,
Maybe I wasn't clear enough in my question:
I want to know how I can check what are "root panel" dimensions in Design view when changed via mouse using resize handles. I don't want to use any UIObject/WIdget methods for that, only mouse (or keyboard) operations that are available wihint Design view.
Whenever I scale design canvas by mouse it is resized but no properties are changed (maybe that's good) but at least something like "designer" canvas view width/height should be somehow visible,
What I'm doing is changing canvas size within "Design" view to check if it fits various devices screen areas (e.g. iPhone vertical/landscape view dimensions),