Index: gtk2_ardour/lv2_plugin_ui.cc
===================================================================
--- gtk2_ardour/lv2_plugin_ui.cc	(revision 14055)
+++ gtk2_ardour/lv2_plugin_ui.cc	(working copy)
@@ -219,18 +219,20 @@
 		features[features_count - 1] = &_external_ui_feature;
 		features[features_count]     = NULL;
 	} else {
-		_ardour_buttons_box = manage (new Gtk::HBox);
-		_ardour_buttons_box->set_spacing (6);
-		_ardour_buttons_box->set_border_width (6);
-		_ardour_buttons_box->pack_end (focus_button, false, false);
-		_ardour_buttons_box->pack_end (bypass_button, false, false, 10);
-		_ardour_buttons_box->pack_end (delete_button, false, false);
-		_ardour_buttons_box->pack_end (save_button, false, false);
-		_ardour_buttons_box->pack_end (add_button, false, false);
-		_ardour_buttons_box->pack_end (_preset_combo, false, false);
-		_ardour_buttons_box->pack_end (_preset_modified, false, false);
-		_ardour_buttons_box->show_all();
-		pack_start(*_ardour_buttons_box, false, false);
+		if (!_ardour_buttons_box) {
+			_ardour_buttons_box = manage (new Gtk::HBox);
+			_ardour_buttons_box->set_spacing (6);
+			_ardour_buttons_box->set_border_width (6);
+			_ardour_buttons_box->pack_end (focus_button, false, false);
+			_ardour_buttons_box->pack_end (bypass_button, false, false, 10);
+			_ardour_buttons_box->pack_end (delete_button, false, false);
+			_ardour_buttons_box->pack_end (save_button, false, false);
+			_ardour_buttons_box->pack_end (add_button, false, false);
+			_ardour_buttons_box->pack_end (_preset_combo, false, false);
+			_ardour_buttons_box->pack_end (_preset_modified, false, false);
+			_ardour_buttons_box->show_all();
+			pack_start(*_ardour_buttons_box, false, false);
+		}
 
 		_gui_widget = Gtk::manage((container = new Gtk::Alignment()));
 		pack_start(*_gui_widget, true, true);