Loads the records from the query set linked with this item.

def load(self):
        """
        Loads the records from the query set linked with this item.
        """
        if self._loaded:
            return
        
        rset = self.recordSet()
        
        QApplication.setOverrideCursor(Qt.WaitCursor)
        self.loadRecords(rset)
        QApplication.restoreOverrideCursor()