context menu when right clicking on a TreeViewColumn header

[Lorenzo Gil Sanchez <lgs sicem biz>]

Hi,

I wonder how can I detect right click mouse button events on the header
of a TreeView so I can display a context popup menu (like Evolution
does).

Button events on the rest of the TreeView are ok, it just I don't get
them when clicking on the button headers.

Regards

Lorenzo Gil Sanchez