[QtRoot] Problem rendering a canvas on Qt widgets

Thank you. I wish I could do more than just wait…

By the way, reading this ([url]Clickable ROOT histograms in QT thread, I got a little anxious about the future of QtRoot.
I guess that ROOT team had repeated a lot of discussions to reach a conclusion, but I wonder how they decided to re-invent the wheel rather than take advantage of Qt, which is nearly complete toolkit for developing GUI application.
I once wrote a GUI app using native ROOT’s TG* classes, but switched to QtRoot. The biggest reason is that Qt has “Designer”. I believe that everyone agrees that using such tool is much more intuitive and productive in layouting widgets than coding by hand. ROOT’s “GUI Builder” seems still under development…