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 DataSetHandle findDataSet( String name )
	{
		DesignElement element = module.findDataSet( name );
		if ( !( element instanceof DataSet ) )
			return null;
		return (DataSetHandle) element.getHandle( element.getRoot( ) );
	}
	/**
	 * Finds a joint data set by name in this module and the included modules.
	 * 
	 * @param name
	 *            name of the joint data set
	 * @return a handle to the joint data set, or <code>null</code> if the
	 *         data set is not found
	 */
	public JointDataSetHandle findJointDataSet( String name )
	{
		DesignElement element = module.findDataSet( name );
		if ( !( element instanceof JointDataSet ) )
			return null;
		return (JointDataSetHandle) element.getHandle( element.getRoot( ) );
	}
	/**
	 * Finds a template data set by name in this module and the included
	 * modules.
	 * 
	 * @param name
	 *            name of the data set
	 * @return a handle to the template data set, or <code>null</code> if the