TabControl & MetroProgressBar

So, scrollbar's in windows, they are a fucking mess. I'm almost going crazy dealing with them, but i finally got it working (partially).

Bugs:
1) MetroScrollBar OnMouseWheel is borked. Take a look at the code annotations :)
2) MetroScrollBar needs to subtract the height of the thumb when scrolling (See tab control demo) as to why.
3) MetroScrollBar values for the horizontal scrollbar reports wrong e.NewValue so it's essentially broken, you will have to investigate why.
4) MetroProgressBar needs style fixes :)