Hi all,
I was able to spot the reason for the crashes. It was the type-casting that was causing a pointer nullification. With a few modifications I was able to fix that I got to render the nodes onto the wheel.

Its just time to play with signals and xml stuff now. :)
Here's a screenshot for interested folks:
Inline image 1
Arshdeep Singh
Third Year, Computer Engineering
Delhi Technological University
Ph: +91-9654115614