WPF Colour Picker/Wheel with Multiple Selection

I am looking for a free WPF Colour Picker/Wheel which has the ability t开发者_如何学Pythono allow multiple colour selections. Does anything like this exist. The ones I have seen allow only one colour to be selected. I want to be able to easily select two or three colors.

Take a look at color wheel for silverlight (you can adapt it for wpf): http://asyrovprog.host22.com/colorwheel.html. Source code is located here: timeline.codeplex.com.