This FilterExpression is valid only for the ContentArchive. It will populate its datasource based on the category you enter. The archive control will show only dates for which you have news items in a given category.
Note that this control caches, so the application should be restarted,otherwise you might see invalid results.
What the ContentArchive does is passing a QueryString with parameters of the date which NewsView and all other ContentView controls uses to filter the datasource. If your NewsView control is not on the same page you should set ArchivePageUrl property. This will tell the ContentArchive control how to build the NavigateUrl of the RadTreeNode used in ContentArchive
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