code: def load(self, walkthrough):
          
          if type(walkthrough) in (str, unicode):
              walkthrough = XWalkthrough.load(walkthrough)
          
          self.setUpdatesEnabled(False)
          self.clear()
          for slide in walkthrough.slides():
              self.addSlide(slide)
          self.setUpdatesEnabled(True)
          self.updateUi()
docs: Loads the XML text for a new walkthrough.
          
          :param      walkthrough | <XWalkthrough> || <str> || <xml.etree.ElementTree.Element>