Bug 146761 All structure properties change can't be restore
Steps to reproduce: 1.New a report, extends lib.table 2.Add a structure property(such as filter, column binding...) on table 3.Choose the table, click "Restore Property" Expected result: Local propery is removed Actual result: Local property can't be removed so that "Restore Property" is always enabled
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/SimpleGroupElementHandle.java
import java.util.List;
import org.eclipse.birt.report.model.activity.ActivityStack;
import org.eclipse.birt.report.model.api.activity.SemanticException;
import org.eclipse.birt.report.model.api.command.NameException;
import org.eclipse.birt.report.model.api.metadata.IElementDefn;
import org.eclipse.birt.report.model.api.metadata.IElementPropertyDefn;
import org.eclipse.birt.report.model.command.NameCommand;
import org.eclipse.birt.report.model.core.DesignElement;
import org.eclipse.birt.report.model.core.Module;
import org.eclipse.birt.report.model.elements.interfaces.IExtendedItemModel;
import org.eclipse.birt.report.model.metadata.ElementPropertyDefn;
import org.eclipse.birt.report.model.metadata.PropertyDefn;
/**
 * Implements a simple group element handle, which has a non-empty selection
 * element list and root module.
 */
public class SimpleGroupElementHandle extends GroupElementHandle
{
	/**
	 * The module that provides overall information, especially the command
	 * stack.
	 */
	protected final Module module;
	/**
	 * List of handles to design elements.
	 */
	protected List elements = null;
	/**
	 * Constructs a handle to deal with a list of report elements. The contents
	 * of the given list should be design element handles.