[Gtk-sharp-list] GTk# dynamic treeview population

[Rampage]

Hello everyone, i have a question about populating treeviews.

i was following this tutorial:
http://www.mono-project.com/GtkSharp_TreeView_Tutorial

and there is a part of the article that explains how to populate a tree.

The problem is that as it's explained in that tutorial, it looks like i have
to define the tree structure immediatelly before rendering it.

i was wondering: is there a way to populate the tree dynamically?

what i mean is:
try to expand a node
an event is triggered and a method is called
the method returns me a list of eventually available children
if the returned value is not null, append the values to the parent
else if the returned value is null: that node doesn't have children

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