This example I used to have does not work any more in the latest Pharo 3:

tree := TreeModel new.

tree openWithSpec.

tree columns: (Array 

with: (TreeColumnModel new displayBlock: [:node | node content first asString ]; headerLabel: 'Name'; yourself)

with: (TreeColumnModel new displayBlock: [:node | node content second asString ]; headerLabel: 'Last Name'; yourself)

with: (TreeColumnModel new displayBlock: [:node | node content third asString ]; headerLabel: 'Age'; yourself)

with: (TreeColumnModel new displayBlock: [:node | node content fourth asString ]; headerLabel: 'Gender'; yourself)).

tree roots: {

{'Benjamin'.'Van Ryseghem'.'26'.'M'} .

{'Pamela'.'Anderson'.'Far too much'.'F'} 

}.  

How can I have a similar behavior to what it used to do ?

Thanks !