Bug 315281 update copyrights for 3.6
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ToolBarManager.java
* manager. If the tool bar control exists, it also adds the menu control to
	 * the tool bar.
	 * 
	 * @param contextMenuManager
	 *            the context menu manager, or <code>null</code> if none
	 * @since 3.0
	 */
	public void setContextMenuManager(MenuManager contextMenuManager) {
		this.contextMenuManager = contextMenuManager;
		if (toolBar != null) {
			toolBar.setMenu(getContextMenuControl());
		}
	}
	private boolean isChildVisible(IContributionItem item) {
		Boolean v;
		
		IContributionManagerOverrides overrides = getOverrides();
		if(overrides == null) {
			v = null;
		} else {
			v = getOverrides().getVisible(item); 
		}
		
		if (v != null) {
			return v.booleanValue();
		}
		return item.isVisible();
	}
}