Add 'setWidget' action for plugin registration

Change-Id: I1ecdc14b7f906e2d3e15f3775af1dc98fd5bf2f8
diff --git a/dev/demo/export.js b/dev/demo/export.js
index ef1c313..3db7bf4 100644
--- a/dev/demo/export.js
+++ b/dev/demo/export.js
@@ -31,7 +31,7 @@
       'icon' : "\uf019",
       'classes' : [ 'button-icon', 'plugin' ],
       'onClick' : {
-        'action' : 'addWidget',
+        'action' : 'setWidget',
         'template' : 'http://localhost:7777/export'
       }
     } ]