flip scrollbar WPF

Question

Hi I am building a control that shows a ruler from 0 to a maximum. The 0 value is at the bottom and the maximum is in a higher y then the 0(The maximum is not visible until we s

Answer 1

I got inspired by some answers here and decided to add mine for further reference.

For the scrollbar it doesn't really matter whether it is rotated 180 degrees or flipped upside down but for other controls (or some style) it may be important.

Here's my code: