Gtk::CellRendererText *text_cr=Gtk::manage(new Gtk::CellRendererText());
text_cr->property_foreground()=Glib::ustring("#7f7f7f");
Gtk::CellRendererText *text_cr=Gtk::manage(new Gtk::CellRendererText());
text_cr->property_foreground()=Glib::ustring("#7f7f7f");