From your code I think you're confusing ListBoxItem and the bound object RssItem . If you're binding correctly RssItem will be the type of the object contained in the ListBoxItem. DataContext .
The SelectionChanged event uses the standard EventHandler pattern which all UI framework events conform to where the first argument sender, of type object, is the source UI element for the event. In this case, as the event is emitted by the ListBox, sender will be a reference to your ListBox.
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