WPF - Create a Control with a Bindable DependancyProperty that affects an image on a button

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WPF

user-controls

Here is a simplification of the problem.

I want a Button with an extra DependancyProperty that I can bind to. The value of this property will control which image is selcted on the button.

Question 2 is do I create a UserControl and draw the button on. If so how do I can use triggers to manage the image BUT I do not know how to do the Templet for a User control e.g.

<Button.Template>
<ControlTemplate TargetType="{x:Type Button}">

Where Button should be the same UserControl name .. but what should I replace {x:Type Button} with for a user control?

The more code examples the better please.

Question 3 if I create a Custom Control do I inherit from Button and just add DependancyProperty?
If I do that .. when I show it on the page it doesn't appear like a button. Just a blank box which wont display anything...