WPF - 将鼠标悬停在一个元素上可显示另一个元素中的内容

I would like to achieve an affect whereby I can hover over a Button and have a TextBlock update its content (via binding). To complicate matters, The Button is one of many buttons defined in an ItemsControl/DataTemplate. The TextBlock is outside the scope of the ItemsControl.I would like to achieve an affect whereby I can