for(next=dock_book_list.begin(),next++,iter=next++;next!=dock_book_list.end();iter=next++)
{
Gtk::Paned* current(manage(is_horizontal?(Gtk::Paned*)new Gtk::HPaned:(Gtk::Paned*)new Gtk::VPaned));
for(next=dock_book_list.begin(),next++,iter=next++;next!=dock_book_list.end();iter=next++)
{
Gtk::Paned* current(manage(is_horizontal?(Gtk::Paned*)new Gtk::HPaned:(Gtk::Paned*)new Gtk::VPaned));