oops

playground/src/containers/PushedScreen.js

     this.onClickPush = this.onClickPush.bind(this);
     this.onClickPop = this.onClickPop.bind(this);
     this.onClickPopPrevious = this.onClickPopPrevious.bind(this);
-    thisw.onClickPopToFirstPosition = this.onClickPopToFirstPosition.bind(this);
+    this.onClickPopToFirstPosition = this.onClickPopToFirstPosition.bind(this);
     this.onClickPopToRoot = this.onClickPopToRoot.bind(this);
   }
   render() {