Bug 182714 [Contributions] Improve toolbar configurability
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ContributionManager.java
* manager as dirty and updates the number of dynamic items.
	 * 
	 * @param item
	 *            remove given parent from list of contributions
	 */
	protected void itemRemoved(IContributionItem item) {
		item.setParent(null);
		markDirty();
		if (item.isDynamic()) {
			dynamicItems--;
		}
	}
	/*
	 * (non-Javadoc) Method declared on IContributionManager.
	 */
	public void markDirty() {
		setDirty(true);
	}
	/*
	 * (non-Javadoc) Method declared on IContributionManager.
	 */
	public void prependToGroup(String groupName, IAction action) {
		addToGroup(groupName, new ActionContributionItem(action), false);
	}
	/*
	 * (non-Javadoc) Method declared on IContributionManager.
	 */
	public void prependToGroup(String groupName, IContributionItem item) {
		addToGroup(groupName, item, false);
	}