Prompts the editing process if the label is editable.
        
        :param      event | <QMouseDoubleClickEvent>

def mouseDoubleClickEvent(self, event):
        """
        Prompts the editing process if the label is editable.
        
        :param      event | <QMouseDoubleClickEvent>
        """
        if self.isEditable():
            self.beginEdit()
        
        super(XLabel, self).mouseDoubleClickEvent(event)