I'm [extending the Aero glass frame](http://msdn.microsoft.com/en-us/library/ms748975.aspx) into the client area and want to place [a search box](http://davidowens.wordpress.com/2009/02/18/wpf-search-text-box/) on the extended frame, just like it Windows Explorer does: 

[![Windows Explorer Search Box](https://i.stack.imgur.com/GQhAX.png)](https://i.stack.imgur.com/GQhAX.png)

The default WPF text box has a grey/blue border though, and not the dark, white glowing border that can be seen on the screenshot. **How do I change the WPF text box to use the same style as the Windows Explorer search box?**