title: WPF Control Templating - How do I create a custom property?
body: <p>I'm currently building a XAML UserControl library using Blend.</p>
  
  <p>I've created a template for my custom WPF slider type. What I'd like to be able to do now is add a custom brush property for the control which will allow easy customisation when designing the application interface (my slider design has a background colour, foreground colour and a thumbnail colour). Is this possible, and if so, will it appear in the Blend interface?</p>
  
  <p>I know I could just create a load of styles, but it seems overkill for just changing a single colour...</p>