Gtk::TreeViewColumn::set_widget()

[Doug McLain <doug nostar net>]

The docs at 
http://www.gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGtk_1_1TreeViewColumn.html#f5c3b04accb5fba7aa4c84e831b8b643 
say that if widget is 0, then a Label will be used.  I am passing 0 to 
this function, but I get:

error: no matching function for call to 
'Gtk::TreeViewColumn::set_widget(int)'
note: candidates are: void Gtk::TreeViewColumn::set_widget(Gtk::Widget&)

How do I do this right?  I don't want to pass a real widget, I want it 
to do exactly what the docs say it does when widget is 0.

Doug
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