WalkMe Player Events
BeforeMenuOpen	Triggered before the menu element is shown.
AfterMenuOpen	Triggered after the menu element is shown.
BeforeMenuClose	Triggered before the menu element is removed.
AfterMenuClose	Triggered after the menu element is removed.
WalkthruSelected	Triggered before the menu element is shown.

WalkMeAPI.events.on('SwtButtonClicked', function(eventData){
    if(eventData.isBack) {
      console.log('Back button is clicked.')
    } else if(!eventData.nextStepId) {
      console.log('Done button is clicked.')
    } else {
      console.log('Next button is clicked. Next step is: ' + eventData.nextStepId)
    }
  });