diff --git a/web/gui/src/main/webapp/app/index.html b/web/gui/src/main/webapp/app/index.html
index 43578ea..53bb8d3 100644
--- a/web/gui/src/main/webapp/app/index.html
+++ b/web/gui/src/main/webapp/app/index.html
@@ -59,6 +59,7 @@
     <script src="fw/widget/widget.js"></script>
     <script src="fw/widget/table.js"></script>
     <script src="fw/widget/toolbar.js"></script>
+    <script src="fw/widget/button.js"></script>
 
     <script src="fw/layer/layer.js"></script>
     <script src="fw/layer/panel.js"></script>