Google App Script

• While you modify element or add widget, you must return app
  

  
function listBoxClick( eventInfo )
{
  var app = UiApp.getActiveApplication();
  Logger.log( "listBoxClick: "  +  eventInfo.parameter.searchListbox ); 
  
  var text = app.getElementById( "text" );
  text.setText( eventInfo.parameter.searchListbox );
  
  var title = app.getElementById( "title" );
  title.setText( eventInfo.parameter.searchListbox );
  
  return app;
}