Bug 145698 Name change won't enable "restore property" button
Steps to reproduce: 1.New a report, extends lib.label 2.Choose the label, switch to property editor, chang its name to "aa" 3.Choose the label again Expected result: "Restore property" button is enabled Actual result: "Restore property" button is grayed out
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
*            an <code>int</code> value, which should be the one defined
	 *            in <code>IVisibleLevelControl</code>.
	 * 
	 * @return theme handles according the input level
	 */
	public List getVisibleThemes( int level )
	{
		List elementList = module.getModuleNameSpace( Module.THEME_NAME_SPACE )
				.getElements( level );
		return generateHandleList( elementList );
	}
	/**
	 * Returns all data source handles that this modules and the included
	 * modules contain.
	 * 
	 * @return all data source handles that this modules and the included
	 *         modules contain.
	 */
	public List getAllDataSources( )
	{
		IModuleNameSpace namescope = module
				.getModuleNameSpace( Module.DATA_SOURCE_NAME_SPACE );
		List elementList = namescope
				.getElements( IModuleNameSpace.ARBITARY_LEVEL );
		return generateHandleList( elementList );
	}
	/**
	 * Returns data source handles that are visible to this modules.
	 * 
	 * @return data source handles that are visible to this modules.