How to make a popup in a TreeView header??

[Jamf <jamf gm gmail com>]

Hello!

I want to have a popup menu in the header of a TreeView for show / hide 
the columns.
The only solution I've found is to use the TreeModelColumn's 
signal_clicked, but this is not what I want.
I want to popup the menu with the right mouse button, and maintain the 
left button for sorting the treeview.

Any suggestions?

Thanks,
Juan Ángel Moreno Fernández