Styling WPF slider background

Answer 1

you need to investigate a bit more into styling and templatiting in wpf. I would expect the easiest way would be to define a Control Template but you 'might' be able to achieve this with just styling

Check out this page on msdn for starters. There is probably loads of other resources out there. Big sections on it in the book i'm reading at the moment - pro wpf in c# 2008

Sorry i'm not coming up with an example... you'd be better off doing a bit of background reading and then coming back with any specific issues.