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
}
    }
    /**
     * Fires a tree expanded event. Only listeners registered at the time this
     * method is called are notified.
     * 
     * @param event
     *           the tree expansion event
     * @see ITreeViewerListener#treeExpanded
     */
    protected void fireTreeExpanded(final TreeExpansionEvent event) {
        Object[] listeners = treeListeners.getListeners();
        for (int i = 0; i < listeners.length; ++i) {
            final ITreeViewerListener l = (ITreeViewerListener) listeners[i];
            SafeRunnable.run(new SafeRunnable() {
                public void run() {
                    l.treeExpanded(event);
                }
            });
        }
    }
    /**
     * Returns the auto-expand level.
     * 
     * @return non-negative level, or <code>ALL_LEVELS</code> if all levels
     *         of the tree are expanded automatically
     * @see #setAutoExpandLevel
     */
    public int getAutoExpandLevel() {
        return expandToLevel;