Make a window look like this

I'm just getting started with WPF applications.

I can't find out how to make a WPF application window look like this one http://windowsclient.net/downloads/f...entry3754.aspx

I've been searching Google for quite a while, and I haven't been able to find anything.
I guess i just don't know what keywords are relevant to this.

So as a last result i turn to the forum, I apologize if this question is out of place.

I just want to make the application (style i guess you would call it / theme) look like the one above or just a regular Windows 7 type. Like the windows explorer window, or IE.

Any help is much appreciated.