title: Removing runtime listeners in corona sdk between the screens
body: <p>In my application I have used many RuntimeListeners,the listeners in one screen will not get removed in other screens.The other screens will get loaded on a button click.The screens are working fine but the event listener of previous screen still remains causing problem to it.
  I have tried with removeEventListener at the tap of the button,the listener gets removed for the first time but for the second time when I change the screens the event listeners remain.
  Thanks for any help </p>