Problems with widgets in header of TreeViewColumn

[Simon Fuhrmann <SimonFuhrmann gmx de>]

Hello!

I want to put a Gtk::CheckButton inside a Gtk::TreeViewColumn header
using the Gtk::TreeViewColumn::set_widget() function. The CheckButton is
visible and sensitive, but I cannot check it, because it is some kind of
disabled or the TreeViewColumn takes over control. Other types of
buttons do not work, too.

I have prepared a small demostration here: http://pastebin.com/373302

I hope someone can help me with this.

Thanks in advance,
Simon Fuhrmann

-- 
Simon Fuhrmann <SimonFuhrmann at gmx.de>
Wer Rechtschreibefehler entdeckt, darf sie behalten.