Updates when the user picks a page size.
        
        :param      pageSize | <str>

def pageSizePicked( self, pageSize ):
        """
        Updates when the user picks a page size.
        
        :param      pageSize | <str>
        """
        try:
            pageSize = int(self._pageSizeCombo.currentText())
        except ValueError:
            pageSize = 0
        
        self.setPageSize(pageSize)
        self.pageSizeChanged.emit(pageSize)