c# - Non client painting on aero glass window

Question

Now Im customizing title bar of my application. My aim is to add one extra button on title bar. Im my previous question people have adviced me the way I can customize non client area. Thats works perfectly except one small thing - glowing! I can draw glowing in nonclient area but I cannot make it spreads out of the window. I also cant find any resource about this subj.

I looked into this sample and made my own test app for investigating non client drawing facilities. Screen shot of my app's window:

So you can see that system button glows out of the windows when my is clipped by borderframe.

For example, Skype's window have four custom buttons in title bar and they can "glow" out of the window frame:

Can anybody advise me to find out the way to draw button's glowing out of the window?
Thanks in advance!

[EDIT]
Thank you everybody for answers!

Answer 1

Skype cheats it, and has a little sliver along the top of their window; where they can draw it.

You can see it with Process Explorer to SpyXX:

See also

MSDN: Custom Window Frame Using DWM