title: javafx choicebox events
body: <p>i have one choicebox in javafx contains 3 items let A B and C so on change of selection of this item i want to perform certain task so how can i handle this events?</p>
  
  <pre><code> final ChoiceBox cmbx=new ChoiceBox();
      try {
          while(rs.next())
           {
              cmbx.getItems().add(rs.getString(2));
  
            }
           } 
          catch (SQLException e) 
             {
          // TODO Auto-generated catch block
          e.printStackTrace();
          }
  </code></pre>
  
  <p>im adding items to choicebox from database...
  now i want to know how to handle the events of choicebox in javafx</p>