Add a SavePng extension to WriteableBitmap (similar to SaveJpeg)
When you create a tile dynamically, it is common to want to save it as a Png file so that it uses transparency (so that it respects the theme accent color).
However, there is no built in method to save a WriteableBitmap as a png.
There is however a nice extension to save it to jpg, but that doesn't help if you want to use transparency to leverage the theme accent color in your tile.
I think many apps that need to generate a tile dynamically will encounter this issue.
Thank you for the suggestion. We are not adding this capability in the 8.0 release, but know that it is high on the consideration list for future Windows Phone releases.
Keep those suggestions and votes coming!