diff --git a/haxework/resources/IResources.hx b/haxework/resources/IResources.hx
index ef4f630..0bc53ed 100755
--- a/haxework/resources/IResources.hx
+++ b/haxework/resources/IResources.hx
@@ -1,8 +1,9 @@
 package haxework.resources;
 
+import haxework.resources.Resources.ResMap;
 import flash.display.BitmapData;
 
 interface IResources {
-  public var image(default, null):Map<String, BitmapData>;
-  public var color(default, null):Map<String, Int>;
+  public var image(default, null):ResMap<BitmapData>;
+  public var color(default, null):ResMap<Int>;
 }
\ No newline at end of file
diff --git a/haxework/resources/Resources.hx b/haxework/resources/Resources.hx
index 24cc516..80e75e9 100755
--- a/haxework/resources/Resources.hx
+++ b/haxework/resources/Resources.hx
@@ -35,12 +35,18 @@ class ResMap<T> extends StringMap<T> {
   private function call(field:F, value:T):Void {
     Reflect.setProperty(field.first, field.second, value);
   }
+
+  public function merge(value:Dynamic<T>):Void {
+    for (field in Reflect.fields(value)) {
+      set(field, Reflect.field(value, field));
+    }
+  }
 }
 
 class Resources implements IResources {
 
-  public var image(default, null):Map<String, BitmapData>;
-  public var color(default, null):Map<String, Int>;
+  public var image(default, null):ResMap<BitmapData>;
+  public var color(default, null):ResMap<Int>;
 
   public function new() {
     image = new ResMap<BitmapData>();