https://github.com/roubachof/Sharpnado.MaterialFrame
https://github.com/roubachof/Sharpnado.Shadows
Shadows gets itself a BitmapCache
Well it was a bit of a journey (https://www.sharpnado.com/shadows-leaks/), but Shadows gets finally its BitmapCache \o/
With this cache for a given Color, BlurRadius and Size, only one instance