mouse click event on Tab header in Tabcontrol

I have my TabControl made in WPF with C#. But I display the window like a bar by using window position. I mean while displaying only tabheader will be display. My tab header are in the left side. When I press the tabheader 开发者_开发百科the window width will increse to fit the tab items content.

So I want the click event of tab headers in tabcontrol. How can I get that?

Two options:

1. Set the window to auto size to it's content using the Window property: SizeToContent
2. Use the TabControl event: SelectionChanged