Thank you for writing.
Currently, overriding these methods is not possible. I have logged a feature request in our Public Issue Tracking System - PITS
. We will do our best to implement in for our next major release which is Q3 2012. You can track the progress of the feature and add your vote to it on the following link - PITS Feature.
I have also updated your Telerik points for the suggestion.
If you have further questions, I would be glad to help.
All the best,
the Telerik team