PreferenceManager mgr = PlatformUI.getWorkbench().getPreferenceManager();
List<IPreferenceNode> preferencePageList = castList(IPreferenceNode.class, mgr.getElements(PreferenceManager.PRE_ORDER));
IPreferenceNode[] rootSubNodes = mgr.getRootSubNodes();
	
IPreferenceNode anode = rootSubNodes[7];
			
IPreferenceNode[] installUpadteSubNode = anode.getSubNodes();
//anode.remove(installUpadteSubNode[0]);
PreferenceNode installNode = (PreferenceNode)installUpadteSubNode[0];
IPreferencePage page = installNode.getPage();