diff --git a/Scripts/AppLoader.js b/Scripts/AppLoader.js
index 105dab67d..78c1be86c 100644
--- a/Scripts/AppLoader.js
+++ b/Scripts/AppLoader.js
@@ -56,6 +56,7 @@ function newAppLoader() {
 
                 'Panels/LayersPanel.js',
                 'Panels/UpDownButton.js',
+                'Panels/LeftRightButton.js',
                 'Panels/Layer.js',
                 'Panels/PlotterPanel.js',
                 'Panels/PanelsVisibleButton.js',