[trunk] Deriving TileLayer from Layer iso ILayer
[trunk]
Deriving TileLayer from Layer iso ILayer

git-tfs-id: [https://tfs.codeplex.com/tfs/TFS01]$/SharpMap/Trunk;C65775

SharpMap/SharpMap,SharpMap/SharpMap,nhvu1988/SharpMap,nhvu1988/SharpMap