Ensure all caps in silverlight as a part of design process

Look at the picture of the silverlight cosmopolitan theme :

Notice how all the labels are ALLCAPS. It is probably done by typing with the CAPS lock on but there is  a blend behavior available that can do it for you on the content presenter.
Check out the sample + code for this behavior here : http://blogs.msdn.com/b/esthetique/archive/2010/08/19/sltv-theme-demo.aspx

Enjoy!