indicator-test.vala

// valac --pkg gtk+-3.0 indicator-test.vala

using Gtk;

void main (string[] args) {
    Gtk.init (ref args);
    var status_icon = new Gtk.StatusIcon.from_stock (Gtk.Stock.MEDIA_PLAY);
    status_icon.set_tooltip_text ("Adjust Sound");
    status_icon.activate.connect (() => {
        print ("clicked");
    });
    status_icon.set_visible (true);
    Gtk.main ();
}