How to Stretch WPF Tab Item Headers to Parent Control Width

Question

Is there a way in XAML to cause the tab item headers to stretch across the width of the tab control?

For example, I have three tabs: red, blue and green. If I have a

Answer 1

I don't know if it will work for tabs, but whenever I've needed to stretch anything to fill a container I've used a ViewBox. Is that the kind of thing you're looking for?