在WPF中自定义控制到Window应用程序

the title isn't really meaningfull... sorry for this.I'll try to explain my issue. I have a bigger project in which i'm trying to implement a new WPF window which contains some custom controls. Going deeper this window should looks like, let's say, a calculator. This calculators has many keys buttons which are "custom controls" inherited from Controls, and their style are defined in Generic.xaml. When i try to debug it, the custom controls (the key buttons) don't appear into the calculator window. I think it's due to something wrong with the Generic.xaml file. Can someone give me a hint ??? Thanks in advance Paolothe title isn't really meaningfull... sorry for