Fixed overlay example to work with restructured GeoLayers.

lib/pixi/maps/geolayer.js

@@ -41,6 +41,10 @@ export class GeoLayer {
         }
     }
 
+    addChild(element) {
+        this.displayObject.addChild(element)
+    }
+
     /**
      * Adapts to a map. If the maplayer should adapt to the parent maplayer,
      * no parameter must be specified.
@@ -248,8 +252,10 @@ export class MapLayer extends GeoLayer {
             this.adapt()
 
             this.changeHandler.call(this, map, oldMap)
-            this.map.onTransform.add(this.transformed.bind(this))
 
+            //Call transform one time manually.
+            this.transformed()
+            this.map.onTransform.add(this.transformed.bind(this))
         } else {
             console.error("Could not set map, it's not of type GeoMap.", map)
         }