add behaviours to demo and fix exceptions in cstyle behaviours

index.html

@@ -196,10 +196,19 @@
     <tr>
       <td >
         <label for="highlight_selected_word">Highlight selected word</label>
-      </td><td>
+      </td>
+      <td>
         <input type="checkbox" id="highlight_selected_word" checked>
       </td>
-      </tr>
+    </tr>
+    <tr>
+      <td >
+        <label for="enable_behaviours">Enable Behaviours</label>
+      </td>
+      <td>
+        <input type="checkbox" id="enable_behaviours">
+      </td>
+    </tr>
     </table>
 
     <div id="editor">