diff --git a/src/laview-core/object-plugins/ObjectDialog.vala b/src/laview-core/object-plugins/ObjectDialog.vala
index 8e72a50..ddfa429 100644
--- a/src/laview-core/object-plugins/ObjectDialog.vala
+++ b/src/laview-core/object-plugins/ObjectDialog.vala
@@ -1,7 +1,7 @@
 namespace LAview.ObjectExample {
 	using Gtk, LAview;
 
-	class MainDialog : Object {
+	public class MainDialog : Object {
 		Dialog dialog;
 		PreferencesDialog preferences_dialog;
 
diff --git a/src/laview-core/object-plugins/PreferencesDialog.vala b/src/laview-core/object-plugins/PreferencesDialog.vala
index 79fd374..62beeed 100644
--- a/src/laview-core/object-plugins/PreferencesDialog.vala
+++ b/src/laview-core/object-plugins/PreferencesDialog.vala
@@ -1,7 +1,7 @@
 namespace LAview.ObjectExample {
 	using Gtk, LAview;
 
-	class PreferencesDialog : GLib.Object {
+	public class PreferencesDialog : GLib.Object {
 		Dialog dialog;
 
 		public bool apply { get; private set; default = false; }
diff --git a/src/laview-core/object-plugins/main.vala b/src/laview-core/object-plugins/main.vala
index e103f7a..3a472de 100644
--- a/src/laview-core/object-plugins/main.vala
+++ b/src/laview-core/object-plugins/main.vala
@@ -30,6 +30,7 @@ namespace LAview.ObjectExample {
 		 */
 		~Plugin () {
 			stdout.puts ("ObjectExample.Plugin deinit () called\n");
+			AppDirs.terminate();
 		}
 
 		/**
@@ -104,7 +105,7 @@ namespace LAview.ObjectExample {
 }
 
 [ModuleInit]
-Type plugin_init (GLib.TypeModule type_module) {
+public Type plugin_init (GLib.TypeModule type_module) {
 	stdout.puts ("---ModuleInit called()---\n");
 	return typeof (LAview.ObjectExample.Plugin);
 }