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
*/
	public List getVisibleDataSources( )
	{
		IModuleNameSpace namescope = module
				.getModuleNameSpace( Module.DATA_SOURCE_NAME_SPACE );
		List elementList = namescope
				.getElements( IModuleNameSpace.NATIVE_LEVEL );
		return generateHandleList( elementList );
	}
	/**
	 * Returns all data set handles that this modules and the included modules
	 * contain.
	 * 
	 * @return all data set handles that this modules and the included modules
	 *         contain.
	 */
	public List getAllDataSets( )
	{
		IModuleNameSpace namescope = module
				.getModuleNameSpace( Module.DATA_SET_NAME_SPACE );
		List elementList = namescope
				.getElements( IModuleNameSpace.ARBITARY_LEVEL );
		return generateHandleList( elementList );
	}
	/**
	 * Returns data set handles that are visible to this modules.
	 * 
	 * @return data set handles that are visible to this modules.
	 */
	public List getVisibleDataSets( )