Creates the drag event for this item.
        
        :param      event | <QMousePressEvent>

def mousePressEvent(self, event):
        """
        Creates the drag event for this item.
        
        :param      event | <QMousePressEvent>
        """
        near_x, near_y = self.nearestPoint(event.pos())
        
        data = self.dragData(x=near_x, y=near_y)
        self.startDrag(data)
        
        super(XChartWidgetItem, self).mousePressEvent(event)