Flex中如何通过mode属性，设置进度条ProgressBar动画状态

<iframe src="http://blog.minidx.com/ext05/pausing-the-animation-in-an-indeterminate-progressbar-control/main.html" width="550" height="380"></iframe>

1. <?xml version="1.0" encoding="utf-8"?>
2. <mx:Applicationxmlns:mx="http://www.adobe.com/2006/mxml"
3. layout="vertical"
4. verticalAlign="middle"
5. backgroundColor="white">
7. <mx:ApplicationControlBardock="true">
8. <mx:Form>
9. <mx:FormItemlabel="mode:">
10. <mx:ComboBoxid="comboBox">
11. <mx:dataProvider>
12. <mx:Array>
13. <mx:Objectlabel="event" />
14. <mx:Objectlabel="polled" />
15. <mx:Objectlabel="manual" />
16. </mx:Array>
17. </mx:dataProvider>
18. </mx:ComboBox>
19. </mx:FormItem>
20. <mx:FormItemlabel="indeterminate:">
21. <mx:CheckBoxid="checkBox" selected="true" />
22. </mx:FormItem>
23. </mx:Form>
24. </mx:ApplicationControlBar>
26. <mx:ProgressBarid="progressBar"
27. indeterminate="{checkBox.selected}"
28. mode="{comboBox.selectedItem.label}"/>
30. </mx:Application>