[platform-swt-dev] Subclassing Shell

[Markus Enzenberger <me@xxxxxxxxxxxxxxxxxxxxx>]

The Eclipse API specification 2.0 for class Shell says:
"This class is not intended to be subclassed"

I read the article "Creating Your Own Widgets using SWT" and understood the 
points made against direct subclassing, but I think in some cases 
subclassing Shell can make sense.

So my question is: is there a technical reason not to subclass Shell?
could anyone explain it?

Thanks

- Markus