code: def addRollout( self, widget, title, expanded = False ):
          
          layout = self.widget().layout()
          item = XRolloutItem(self, widget, title, expanded)
          layout.insertWidget(layout.count() - 1, item)
          return item
docs: Adds a new widget to the rollout system.
          
          :param      widget      | <QWidget>
                      title       | <str>
                      expanded    | <bool>
          
          :return     <XRolloutItem>