Adds the inputed item to this group.
        
        :param      item | <QtGui.QGraphicsItem>

def addToGroup(self, item):
        """
        Adds the inputed item to this group.
        
        :param      item | <QtGui.QGraphicsItem>
        """
        effect = QtGui.QGraphicsDropShadowEffect(self.scene())
        effect.setColor(QtGui.QColor('black'))
        effect.setOffset(0, 0)
        effect.setBlurRadius(40)
        item.setGraphicsEffect(effect)
        
        item.setParentItem(self)
        super(XWalkthroughGraphic, self).addToGroup(item)