Trips&Ticks: Do you know how you can extract various instances of one object out of resources in WPF?

Download source files - here

I often use a style&template that is magnificent possibility of WPF. It allows to define one style out of resources to many elements. I can easily define instance of some object in resources and extract it there where I require. But it has one limitation:
For example for following:

XAML:
<Button x:Key="ButtonPrototype" />

C#:
Resources["ButtonPrototype"]; - returns always one instance (like Singlton Pattern). But what can I make if I require more than one such object? It isn't problem as XAML is very flexible and x:Shared attribute eliminates this trouble. Following code will extract various instances:

XAML:
<Button x:Key="ButtonPrototype" x:Shared="False" />

C#
Resources["ButtonPrototype"]

PS: In my opinion last realization shares traits with Prototype Pattern.