JXtreeTable игнорирует getValueAt для узлов дерева

У меня есть JXTreeTable, который имеет дерево узлов (разные типы данных) с левой стороны и сетку с правой стороны (по умолчанию).

Теперь я хочу, чтобы все отображаемые значения (также заголовки деревьев) брались из метода getValueAt(row,column), но вместо узлов дерева отображались их методом toString()

Как я могу заставить JXTreeTable не принимать класс toString() и использовать значение, возвращаемое getValueAt(...)?

Спасибо!

вот моя модель:

public class TreeTableGroupTreeTableModel extends AbstractTreeTableModel {

    private final static String[] COLUMN_NAMES = { "Tree",
            "Add/Edit", "Remove" };

    //Group-Hierarchy:
    private JXGroup groupRootObject;

    public TreeTableGroupTreeTableModel(JXGroup groupRoot) {

        this.groupRootObject = groupRoot;

    }

// Here is my structure:
//GROUP 1-1 ModuleAggregation 1-* Modules 1-1 JXGroupAccessMemberAggregation 1-* JXGroupAccessSimpleUserObjectLeaf

    /**
     * Returns the value for the node at columnIndex. The node must be managed
     * by this model. Unamanaged nodes should throw an IllegalArgumentException.
     * 
     * 
     * node - the node whose value is to be queried column - the column whose
     * value is to be queried
     */
    @Override
    public Object getValueAt(Object node, int column) {

        System.out.println(node.getClass());

        if (node instanceof JXGroup) {
            switch (column) {
            case 0:
                return "this should render this string instead of the class tostring()";//((JXGroup) node);
            case 1:
            case 2:
                return "";
            }
        } else if (node instanceof JXGroupAccessModuleAggregation) {
            switch (column) {
            case 0:
                return "Modules";
            case 1:
                return "ADD";
            case 2:
                return "REMOVE ALL";
            }
        } else if (node instanceof JXGroupAccessModule) {
            switch (column) {
            case 0:
                return ((JXGroupAccessModule) node).getModule();
            case 1:
                return "ADD";
            case 2:
                return "REMOVE";
            }
        } else if (node instanceof JXGroupAccessMemberAggregation) {
            switch (column) {
            case 0:
                return "Members";
            case 1:
                return "ADD";
            case 2:
                return "REMOVE ALL";
            }
        } else if (node instanceof JXGroupAccessSimpleUserObjectLeaf) {
            switch (column) {
            case 0:
                SimpleUserObject c = FunctionsUser.getUser(
                        metaDataPackage.getUsers(),
                        ((JXGroupAccessSimpleUserObjectLeaf) node).getUserId().getId());
                return c.getShowAs();
            case 1:
                return "";
            case 2:
                return "REMOVE";
            }
        } 

        return null;
    }

    /**
     * Sets the value for the node at columnIndex to value. The node must be
     * managed by this model. Unamanaged nodes should throw an
     * IllegalArgumentException.
     * 
     * value - the new value node - the node whose value is to be changed column
     * - the column whose value is to be changed
     */
    @Override
    public void setValueAt(Object value, Object node, int column) {

        return; // changes are not allowed

    }

    @Override
    public Object getRoot() {
        return groupRootObject;
    }

    @Override
    public int getColumnCount() {
        return COLUMN_NAMES.length;
    }

    @Override
    public String getColumnName(int column) {
        return COLUMN_NAMES[column];
    }

    @Override
    public boolean isCellEditable(Object node, int column) {
        return false;
    }

    @Override
    public boolean isLeaf(Object node) {
        return node instanceof JXGroupAccessCategoryLeaf
                || node instanceof JXGroupAccessChapterLeaf
                || node instanceof JXGroupAccessEntryLeaf
                || node instanceof JXGroupAccessSimpleUserObjectLeaf;
    }

    @Override
    public int getChildCount(Object obj) {

        if (!(obj instanceof JXICountable)) {
            System.out.println("parsing error. should be JXCountable (but is "
                    + obj.getClass() + ")");
            return 0;
        }

        JXICountable obj2 = (JXICountable) obj;

        return obj2.getChildrenCount();

    }

    @Override
    public Object getChild(Object parent, int index) {
        if (parent instanceof JXITreeNodeAble) {
            return ((JXITreeNodeAble) parent).getChild(index);
        }
        throw new IllegalArgumentException(
                "parent is not a member of JXITreeNodeAble");
    }

    @Override
    public int getIndexOfChild(Object parent, Object child) {
        if (parent instanceof JXITreeNodeAble) {
            return ((JXITreeNodeAble) parent).getIndexOfChild(child);
        }
        throw new IllegalArgumentException(
                "parent is not a member of JXITreeNodeAble");
    }
}