如何从TableView获取ComboBox？

import javafx.scene.control.ComboBox;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.util.Callback;

public class ComboBoxTableCell<S, T> extends TableCell<S, T> {
    private ComboBox<T> comboBox;

    public ComboBoxTableCell() {
        comboBox = new ComboBox<>();
    }

    @Override
    protected void updateItem(T item, boolean empty) {
        super.updateItem(item, empty);
        if (empty) {
            setGraphic(null);
        } else {
            setGraphic(comboBox);
            comboBox.setValue(item);
        }
    }

    public static <S, T> Callback<TableColumn<S, T>, TableCell<S, T>> forTableColumn() {
        return param -> new ComboBoxTableCell<>();
    }
}

TableColumn<Item, String> column = new TableColumn<>("Column");
column.setCellFactory(ComboBoxTableCell.forTableColumn());