diff --git a/src/ConfigWindow.vala b/src/ConfigWindow.vala
index 818ad22..e0e860e 100644
--- a/src/ConfigWindow.vala
+++ b/src/ConfigWindow.vala
@@ -33,7 +33,8 @@ class ConfigWindow : Dialog {
 		position = WindowPosition.CENTER;
 
 		var table = new Gtk.Table(1,4,false);
-		vbox.pack_start(table, false, true, 10);
+		var content = this.get_content_area () as Gtk.Box;
+		content.pack_start(table, false, true, 10);
 
 		fullscreen_control_window = new Gtk.CheckButton.with_label("Fullscreen Configuration Window");
 		table.attach(fullscreen_control_window, 0, 2, 0, 1, Gtk.AttachOptions.FILL, 0, 0, 0);
diff --git a/src/ErrorDialog.vala b/src/ErrorDialog.vala
index 5f19b29..18d6a8c 100644
--- a/src/ErrorDialog.vala
+++ b/src/ErrorDialog.vala
@@ -29,12 +29,14 @@ class ErrorDialog : Dialog {
 		var label = new Label(message);
 		var hbox = new HBox(false, 0);
 		var img = new Image.from_stock(Stock.DIALOG_ERROR, IconSize.DIALOG);
+		var content = this.get_content_area () as Gtk.Box;
+
 		hbox.pack_start(img, false, true, 10);
 		hbox.pack_start(label, false, true, 10);
 
 		this.set_icon_name("gtk-dialog-error");
 		this.title = title;
-		this.vbox.pack_start(hbox, false, true, 10);
+		content.pack_start(hbox, false, true, 10);
 		this.add_button (Stock.CLOSE, ResponseType.CLOSE);
 		this.destroy.connect(Gtk.main_quit);
 		this.response.connect(Gtk.main_quit);