diff --git a/examples/ViewExample.hx b/examples/ViewExample.hx
index 6d9a8e2..8e6b891 100755
--- a/examples/ViewExample.hx
+++ b/examples/ViewExample.hx
@@ -10,18 +10,21 @@ import flash.display.Sprite;
 @:file("examples/form.json")
 class Form extends JsonAsset {}
 
-class ViewExample {
+class ViewExample implements ButtonViewListener {
 
   public static function main() {
+    new ViewExample();
+  }
+
+  public function new() {
     var form:Dynamic = new Form().value;
-    var listener = {
-      onPress:function(view:ButtonView):Void {
-        trace("onPress: " + view.id);
-      }
-    };
-    var v:IGroupView<Sprite> = GuiBuilder.build(form, {listener:listener});
+    var v:IGroupView<Sprite> = GuiBuilder.build(form, {listener:this});
     new Root(v);
     var button3:ButtonView = v.findViewById("panel:button3");
     trace(button3.id);
   }
+
+  public function onPress(view:ButtonView):Void {
+    trace("onPress: " + view.id);
+  }
 }
\ No newline at end of file
diff --git a/haxework/gui/ButtonView.hx b/haxework/gui/ButtonView.hx
index 129eeb0..f2ba579 100755
--- a/haxework/gui/ButtonView.hx
+++ b/haxework/gui/ButtonView.hx
@@ -37,6 +37,6 @@ class ButtonView extends LabelView {
   }
 }
 
-typedef ButtonViewListener = {
+interface ButtonViewListener {
   public function onPress(view:ButtonView):Void;
 }
\ No newline at end of file