Warning fixed

demo/elements/trivalent-page/trivalent-page.html

@@ -46,7 +46,10 @@
       		this.selected = 0
       	}
       	else this.selected = 1
-      	}
+      },
+      _clientChanged: function () {
+        return;
+      }
     });
   </script>
-</dom-module>
\ No newline at end of file
+</dom-module>