Style within DataTemplate is only being applied to the last item in ItemsControl?

Question

In the XAML below, I have an ItemsControl that has three DataObjects.
I use a DataTemplate to display DataObjects as Buttons with an \"X\" on them.
The Button uses a

Answer 1

The answer to this is rather simple actually, every visual can only be the child of one object, unlike text like "X" which is just data.

If you create a style like this: