connect().ing to a clickable treeview header

[Doug McLain <doug nostar net>]

I've got a single column treeview with the header set to clickable via:

TreeViewColumn* col = tview->get_column (0);
col->set_clickable (true);

I use tview->signal_button_release_event().connect() to handle 
selections to the treeview, but I also want to add some custom 
functionality to the header (not for sorting). Clicking on the header 
doesnt trigger tview->signal_button_release_event(), and I cant figure 
out how to catch a click of the header.  Anyone?

Doug
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