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WPF XAML: How to trigger style change in ListBoxItem ancestor to user class?

I have an ObservableCollection of items of my class "PlaylistItem" that implements INotifyPropertyChanged. The collection is databound to a ListBox and everything else is working.

I want to know what markup to use to trigger a style change of the wrapping ListBoxItem based on a property (e.g. "Playing", bool) of the PlaylistItem. How to I use FindAncestor to trigger the change? I can to this in code, but I know I that I can (somehow) do it in markup.

Thanks in advance.

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