Any information about using gio.Settings would be really appreciated too.
Hi Ivan,
I would recommend you to search for information about Gtk under valadoc pages [1]. You'll get Vala syntax but doing the mental-mapping to D+GtkD is automatic, i.e TreeView [2] and Glib Settings [3].
A. Corbi [1] https://valadoc.org/index.htm [2] https://valadoc.org/gtk+-3.0/Gtk.TreeView.html [3] https://valadoc.org/gio-2.0/GLib.Settings.html