title: How to use WriteableBitmap
body: <p>I'm trying my best to follow this tutorial here <a href="http://blogs.msdn.com/b/davrous/archive/2013/06/13/tutorial-series-learning-how-to-write-a-3d-soft-engine-from-scratch-in-c-typescript-or-javascript.aspx" rel="nofollow">http://blogs.msdn.com/b/davrous/archive/2013/06/13/tutorial-series-learning-how-to-write-a-3d-soft-engine-from-scratch-in-c-typescript-or-javascript.aspx</a> and have come across a problem that I can't seem to fix, I'm trying to create a WriteableBitmap instance like "private WriteableBitmap bmp;" and it says the type/namespace could not be found... I think it's because the namespace "using Windows.UI.Xaml.Media.Imaging;" is also saying it can't be found... am I supposed to be adding a reference to the project? I have no clue >_&lt;</p>