right:
Gtk.TreeStore
Gtk.ListStore
+ Gtk.TreeModelFilter
Gtk.TreeViewColumn
+
+left:
+ Gtk.TreeModelFilter
+
+right:
+ Gtk.TreeStore
+ Gtk.ListStore
left:
Gtk.TreeViewColumn
right:
Gtk.CellRendererText
Gtk.CellRendererCombo
Gtk.CellRendererToggle
+
left:
Gtk.CellRendererCombo:model
Gtk.ComboBox