Hi,

I'm taking a look at the FileDialogWindow:
   FileDialogWindow new open.

On the left, there is a tree. With the halo, I know it is a TreeListMorph.
Here is my question:

How can I know what is happening when I click on one of the little arrows which are just on the left of a directory name? With my changes, the subtree is very slow to be displayed and I don't understand what is called.

Adrien.