Adjust the start and end ranges for this item based on the limits from
        its children.  This method will only apply to group items.
        
        :param      recursive | <bool>

def adjustRange(self, recursive=True):
        """
        Adjust the start and end ranges for this item based on the limits from
        its children.  This method will only apply to group items.
        
        :param      recursive | <bool>
        """
        if ( self.adjustmentsBlocked('range') ):
            return
        
        if ( self.itemStyle() == self.ItemStyle.Group ):
            dateStart = self.dateStart()
            dateEnd   = self.dateEnd()
            first     = True
            
            for c in range(self.childCount()):
                child       = self.child(c)
                
                if ( first ):
                    dateStart = child.dateStart()
                    dateEnd   = child.dateEnd()
                    first     = False
                else:
                    dateStart   = min(child.dateStart(), dateStart)
                    dateEnd     = max(child.dateEnd(), dateEnd)
            
            self._dateStart = dateStart
            self._dateEnd   = dateEnd
            
            self.sync()
        
        if ( self.parent() and recursive ):
            self.parent().adjustRange(True)