Adding methods to a class already written in a tree

Dear ROOTers,

When i include an object in a tree, is also the class definition included in some way in the tree?
I mean: can i add methods (only methods no other variables) to the class definition without recreating the tree again?

Thx,
Matteo

We only stored the information about the persitent data member.
Adding a new method will have no effect on the reading of the TTree.

Philippe.