Accessing a ProgressBar within a ListBox of buttons?

This is where MVVM can really help - you've already got a data binding to your ViewModel presumably from looking at your XAML.

If you want to update bound items within the ItemTemplate you'll need to update the bindings as you can't refer to instances of such items by name. (Because you can't have multiple items with the same name.) In the Click event handler you can access the viewmodel instance via the sender and manipulate the properties there.

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