remove binding hacks from core_selector example
remove binding hacks from core_selector example

ronlobo/core-elements,orgsea/core-elements,orgsea/core-elements,dart-archive/core-elements,orgsea/core-elements,ronlobo/core-elements,dart-archive/core-elements,orgsea/core-elements,ronlobo/core-elements,ronlobo/core-elements,dart-archive/core-elements,dart-archive/core-elements