Bug 111631 [Viewers] TreeViewer needs more TableViewer API
As the TreeViewer is meant to replace the TableTreeViewer we need to add some of the API that the TableViewer had to it so that it can be used like a table. public void insert(Object element, int position) public void add(Object[] objects) Both need to be added.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
*           the SWT tree listener
     */
    protected abstract void addTreeListener(Control control,
            TreeListener listener);
    
    protected void associate(Object element, Item item) {
        Object data = item.getData();
        if (data != null && data != element && equals(data, element)) {
            
            
            
            unmapElement(data, item);
            item.setData(element);
            mapElement(element, item);
        } else {
            
            super.associate(element, item);
        }
    }
    /**
     * Collapses all nodes of the viewer's tree, starting with the root. This
     * method is equivalent to <code>collapseToLevel(ALL_LEVELS)</code>.
     */
    public void collapseAll() {
        Object root = getRoot();
        if (root != null) {
            collapseToLevel(root, ALL_LEVELS);
        }
    }
    /**