Simple (I think) Horizontal Line in WPF?

Question

Creating a relatively simple data entry form, and just want to separate certain sections with a horizontal line (not unlike an HR tag in HTML) that stretches the full length

Answer 1

I had the same issue and eventually chose to use a Rectangle element:

In my opinion it's somewhat easier to modify/shape than a separator. Of course the Separator is a very easy and neat solution for simple separations :)