视图模型导入对话框，然后给予状态改变或是命令来触发对话框服务。

The view model can import the dialog, then based on some change in state or a command, trigger the dialog service.

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下次显示列表时，差事的状态可能已经改变了，必须使用更新的差事列表将新的视图bean实例化。

The next time the list is displayed, the status of the errands will have changed, and a new view bean will have to be instantiated using the updated list of errands.

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下次显示列表时，差事的状态可能已经改变了，必须使用更新的差事列表将新的视图bean实例化。

The next time the list is displayed, the status of the errands will have changed, and a new view bean will have to be instantiated using the updated list of errands.

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