diff --git a/MapControl/Shared/MapTileLayer.cs b/MapControl/Shared/MapTileLayer.cs
index 528d6986..9dc051a5 100644
--- a/MapControl/Shared/MapTileLayer.cs
+++ b/MapControl/Shared/MapTileLayer.cs
@@ -146,7 +146,7 @@ namespace MapControl
                     Children.Add(tile.Image);
                 }
 
-                TileImageLoader.LoadTiles(Tiles, TileSource, SourceName);
+                LoadTiles(Tiles, SourceName);
             }
         }
 
diff --git a/MapControl/Shared/MapTileLayerBase.cs b/MapControl/Shared/MapTileLayerBase.cs
index ec0d4f13..746d5be8 100644
--- a/MapControl/Shared/MapTileLayerBase.cs
+++ b/MapControl/Shared/MapTileLayerBase.cs
@@ -19,7 +19,7 @@ namespace MapControl
 {
     public interface ITileImageLoader
     {
-        void LoadTiles(IEnumerable<Tile> tiles, TileSource tileSource, string sourceName);
+        void LoadTiles(IEnumerable<Tile> tiles, TileSource tileSource, string cacheName);
     }
 
     public abstract class MapTileLayerBase : Panel, IMapLayer
@@ -189,5 +189,10 @@ namespace MapControl
         protected abstract void UpdateTileLayer(bool tileSourceChanged);
 
         protected abstract void SetRenderTransform();
+
+        protected virtual void LoadTiles(IEnumerable<Tile> tiles, string cacheName)
+        {
+            TileImageLoader.LoadTiles(tiles, TileSource, cacheName);
+        }
     }
 }
diff --git a/MapControl/Shared/TileImageLoader.cs b/MapControl/Shared/TileImageLoader.cs
index 739f5390..d1e8907b 100644
--- a/MapControl/Shared/TileImageLoader.cs
+++ b/MapControl/Shared/TileImageLoader.cs
@@ -30,7 +30,7 @@ namespace MapControl
         public static TimeSpan DefaultCacheExpiration { get; set; } = TimeSpan.FromDays(1);
 
         /// <summary>
-        /// Format string for creating cache keys from the sourceName argument passed to LoadTilesAsync,
+        /// Format string for creating cache keys from the cacheName argument passed to LoadTilesAsync,
         /// the ZoomLevel, XIndex, and Y properties of a Tile, and the image file extension.
         /// The default value is "{0}/{1}/{2}/{3}{4}".
         /// </summary>
@@ -56,10 +56,10 @@ namespace MapControl
 
         /// <summary>
         /// Loads all pending tiles from the tiles collection.
-        /// If tileSource.UriFormat starts with "http" and sourceName is a non-empty string,
+        /// If tileSource.UriFormat starts with "http" and cacheName is a non-empty string,
         /// tile images will be cached in the TileImageLoader's Cache (if that is not null).
         /// </summary>
-        public void LoadTiles(IEnumerable<Tile> tiles, TileSource tileSource, string sourceName)
+        public void LoadTiles(IEnumerable<Tile> tiles, TileSource tileSource, string cacheName)
         {
             tileQueue.Clear();
 
@@ -70,9 +70,9 @@ namespace MapControl
                 if (Cache != null &&
                     tileSource.UriFormat != null &&
                     tileSource.UriFormat.StartsWith("http") &&
-                    !string.IsNullOrEmpty(sourceName))
+                    !string.IsNullOrEmpty(cacheName))
                 {
-                    loadTile = tile => LoadCachedTileAsync(tile, tileSource, sourceName);
+                    loadTile = tile => LoadCachedTileAsync(tile, tileSource, cacheName);
                 }
                 else
                 {
@@ -109,7 +109,7 @@ namespace MapControl
             Interlocked.Decrement(ref taskCount);
         }
 
-        private static async Task LoadCachedTileAsync(Tile tile, TileSource tileSource, string sourceName)
+        private static async Task LoadCachedTileAsync(Tile tile, TileSource tileSource, string cacheName)
         {
             var uri = tileSource.GetUri(tile.XIndex, tile.Y, tile.ZoomLevel);
 
@@ -122,7 +122,7 @@ namespace MapControl
                     extension = ".jpg";
                 }
 
-                var cacheKey = string.Format(CacheKeyFormat, sourceName, tile.ZoomLevel, tile.XIndex, tile.Y, extension);
+                var cacheKey = string.Format(CacheKeyFormat, cacheName, tile.ZoomLevel, tile.XIndex, tile.Y, extension);
 
                 await LoadCachedTileAsync(tile, uri, cacheKey).ConfigureAwait(false);
             }
diff --git a/MapControl/Shared/WmtsTileLayer.cs b/MapControl/Shared/WmtsTileLayer.cs
index 413616d1..0e429ccc 100644
--- a/MapControl/Shared/WmtsTileLayer.cs
+++ b/MapControl/Shared/WmtsTileLayer.cs
@@ -162,15 +162,15 @@ namespace MapControl
             }
 
             var tileSource = TileSource as WmtsTileSource;
-            var sourceName = SourceName;
+            var cacheName = SourceName;
 
             if (tileSource != null && tileMatrixSet != null)
             {
                 tileSource.TileMatrixSet = tileMatrixSet;
 
-                if (sourceName != null)
+                if (cacheName != null)
                 {
-                    sourceName += "/" + tileMatrixSet.Identifier
+                    cacheName += "/" + tileMatrixSet.Identifier
                         .Replace(':', '_')
                         .Replace(';', '_')
                         .Replace(',', '_')
@@ -179,7 +179,7 @@ namespace MapControl
                 }
             }
 
-            TileImageLoader.LoadTiles(tiles, tileSource, sourceName);
+            LoadTiles(tiles, cacheName);
         }
 
         private async void OnLoaded(object sender, RoutedEventArgs e)
diff --git a/MapControl/Shared/WmtsTileSource.cs b/MapControl/Shared/WmtsTileSource.cs
index 203f2f48..f5309b91 100644
--- a/MapControl/Shared/WmtsTileSource.cs
+++ b/MapControl/Shared/WmtsTileSource.cs
@@ -14,7 +14,10 @@ namespace MapControl
         {
             Uri uri = null;
 
-            if (UriFormat != null && TileMatrixSet != null && zoomLevel >= 0 && zoomLevel < TileMatrixSet.TileMatrixes.Count)
+            if (UriFormat != null &&
+                TileMatrixSet != null &&
+                zoomLevel >= 0 &&
+                zoomLevel < TileMatrixSet.TileMatrixes.Count)
             {
                 uri = new Uri(UriFormat
                     .Replace("{TileMatrixSet}", TileMatrixSet.Identifier)