How do I get a WPF slider control with 3 thumbs

I want to use a slider control which has 3 thumbs - they are not required to cross each other, but the user should be able to move any of the thumbs independently.

Background : I have created a pairs trading application which needs input of :

1.training set begin date

2.training set end date or test set big date (they are same)

3.test set end date

I have done it using 3 slider controls placed one below the other, but it is confusing to use. I am hoping to use a si开发者_JAVA百科ngle control instead if possible.

You might be able to adapt the control on here to have a third slider

You can also find a good example, for creating slider with more than one thumb, here.