We have a fairly large application migrated from 3.3.1 -> 4.0 that could help possibly help you with development and testing. The performance suffers greatly in IE but is otherwise fine in web-kit/FF browsers.
It would be impossible to post the code on the forum because we are not open source (unfortunately), plus the code is just to large.
If you are interested we can arrange a port to be opened on my dev box or provide vpn access and can allow some collaboration.
Here's a breakdown of what we do:
We are providing a world-class customizable dashboard tool which allows placement of widgets:
- Charting (currently we are using Anychart but want to move to your charting because of some the features)
- Grid/Pivot Data
- Chart Parameter controls
- Several misc. controls
If interested, please send an e-mail to firstname.lastname@example.org and we can talk more about it offline.