I am looking for a way to act before a tree branch is
expanded (when user clicks the disclosure icon of a closed branch).
My objective is to prevent the expansion (if the right password is
not supplied). There is an example of what I mean at
develapsetech.ca:8006 Click English then expand the IT node, try to
expand the grayed Other Viewable Types node, it will ask you for a
password (which is Servier). But you will be able to see the opened
branch for half a second.
I use a listener for the nodeOpen event but it is already too
late in my case, even if the first thing I do is to collapse the
node I can still see it's content for a fraction of a second.
I am sure there is a way to achieve this, someone has an