Create a base window in WPF

Question

hi

i'm looking for a way to create a base window in my WPF project and

every other window Inheritance this base window,for example create a 

window with specific border,background and..., and other windows inheritance

these style.i just understood i should create a base class from this link :

http://stackoverflow.com/questions/7174315/understanding-wpf-deriving-window-class

 can you help me how to create base window?

thanks