Max, I think you can create a base class which can be inherited by all
your user controls

here's a small tip how it can be implemented (it's about aspx, but
it's the same)
http://www.codeguru.com/csharp/.net/net_asp/webforms/article.php/c11939/

Hi Max,

I'm afraid MasterPages cannot be used on UserControl.

However, I'm not sure your objective here. Based on my understanding,
UserControl is designed to be re-used. For example: if you need to use the
controls layout in a UserControl, simply put an instance of it on your new
UserControl.

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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No - in fact, MasterPages are UserControls too...

Generally speaking, a UserControl is designed for re-use, so you shouldn't
need to worry about this - just drop it onto the page where required, and
let its controls assume their styles from whichever CSS is in use for the
main page...