code: function(){
  			document.getElementById('messageLabel').classList.remove("errorMessage"); //$NON-NLS-0$ //$NON-NLS-1$
  			document.getElementById('messageContainer').classList.remove("errorMessage"); //$NON-NLS-0$ //$NON-NLS-1$
  			lib.empty(document.getElementById('messageText')); //$NON-NLS-0$
  			document.getElementById('messageContainer').classList.remove("showing"); //$NON-NLS-0$ //$NON-NLS-1$
  		}
docs: Hides the message bar panel.