[news.eclipse.modeling.gmf] the right wat to invoke a Operation on a vie

["Theo" <NOSAPM@xxxxxxx>]

Hi there,
from an EditPolicy I have to invoke operations ( from the notational model) 
on a
view.
What's the recommended way to do it?
Should I put it in a TransactionalCommand, just as when setting a structural 
feature
or calling a operation is specific?
Thanks