Thank you for the quick answer! It seems that my problem was layout specific. Your Dojo really helped me understand what was wrong, I used a layered layout that I applied after the bringIntoShape function, which result in the wrong diagram disposition. The dojo http://dojo.telerik.com/ofezEken/3 is the solution that I made, Thanks again!
For the matter, I encounter another bug with the diagram. Maybe it's not the right place to post this, but i'm going to take a shot anyway, stop me if it's beyond the purpose of the forum.
I used my diagram inside of a tab, which when loaded from another tab (picture otherTab.jpg), the visual template don't load properly (picture tabDiagram.jpg). My diagram is inside an iframe which look like this:
"height:620px;width:100%; pointer-events:none; overflow: hidden;"
What is weird is that when I load the frame from the right tab, it's loaded properly and all things are great, from the other tab, The visual template always ends up to have my two TextBlocks on top of the other. My visual template: