JavaFx instance in FXML

I try fxml feature in javaFX

1. how to specify a title while creating TabedPane? the code below don't work

   <Accordion >
           <panes>
               <TitledPane>
                   <title>
                       <String fx:value="123"/>
                   </title>
                   <content>
                       <Text text="123"/>
                   </content>
   
      开发者_Python百科         </TitledPane>
           </panes>
       </Accordion>
   

2 how to instantiate Duration for animation?

<Duration><Double fx:value="300"/></Duration>

answer on 2 TitledPane extends Labeled therefore has property text

<TitledPane text="header">
            <content>
                <Text text="123"/>
            </content>

        </TitledPane>