Starts loading this item for the batch.

def startLoading(self):
        """
        Starts loading this item for the batch.
        """
        if super(XBatchItem, self).startLoading():
            tree = self.treeWidget()
            if not isinstance(tree, XOrbTreeWidget):
                self.takeFromTree()
                return
            
            next_batch = self.batch()
            tree._loadBatch(self, next_batch)