fixes in enabling / disabling widgets in runtime

src/public/javascripts/widgets/basic_widget.js

@@ -13,9 +13,15 @@ class BasicWidget extends Component {
             this.appContext.trigger(eventName);
         });
 
+        this.toggle(this.isEnabled());
+
         return $widget;
     }
 
+    isEnabled() {
+        return true;
+    }
+
     /**
      * for overriding
      */