In line 9, you get the listbox and invoke its update method.
第9行，您可以获取listbox并调用其update方法。
Here's the ingenious part, you use it just as you would any other listbox!
下面是独创性的部分，你使用它就像任何其他列表框！
How to notify about changing property of ListBox item?
如何通知改变列表项属性？
How to notify about changing property of ListBox item?
如何通知改变列表项属性？
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