title: javafx treetableview cell value not getting updated
body: <p>Event after updating the data model javafx treetableview cell value not getting updated.</p>
  
  <p>I am using the sample code here @ <a href="http://docs.oracle.com/javase/8/javafx/user-interface-tutorial/tree-table-view.htm" rel="nofollow">http://docs.oracle.com/javase/8/javafx/user-interface-tutorial/tree-table-view.htm</a>
  (Example 15-2)</p>
  
  <p>On click of button i m trying to update first item: employees.get(0).setName("Test");</p>
  
  <p>Is there any trick using which treetableview can be updated?</p>