GtkHeaderBar childs disabled

["Victor A. Santos" <victoraur santos gmail com>]

Every child of GtkHeaderBar is disabled (i.e. grayed-out) unless
explicitely set "sensitive" property to True.

source of what I'm trying can be fount at:
https://github.com/hotvic/ROM-Browser
(see files data/ui/rbmw.ui; src/rombrowserappwindow.c;)

Is this the default behavior, I'm forgetting to do something, or what ?

Thank You in advance.
-- 
Victor A. Santos <victoraur santos gmail com>