Bug 127861 [DataBinding] Mark API provisional
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/ListUpdatableCollection.java
private final List elements;
	private boolean updating;
	/**
	 * @param elements
	 * @param elementType
	 */
	public ListUpdatableCollection(List elements, Class elementType) {
		this.elements = elements;
	}
	public int computeSize() {
		return elements.size();
	}
	public int addElement(Object value, int index) {
		updating = true;
		try {
			elements.add(index, value);
			fireChangeEvent(ChangeEvent.ADD, null, value, index);
			return index;