Generator: [MVVM] Drawing tiles using binding.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS15]$/Atomix;C40405
Generator: Clean-up code-behind code replaced by MVVM.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS15]$/Atomix;C40406