[spec] set ballonText on a treeNode

Hi

I think this is spec related.

How can I set a ballonText on aTreeNode?

I was  expecting something like:

                tree childrenBlock: [ :anObject | self childrenFor: anObject ];

                                displayBlock:  [ :anObject | self labelFor: anObject ];

                                helpBlock:  [ :anObject | self helpFor: anObject ];

                                …

but the last one is not available and I can not find something suitabe.

How is the expected way?

Best

Emilio