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
{
		return module;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#getModuleHandle()
	 */
	public ModuleHandle getModuleHandle( )
	{
		return (ModuleHandle) module.getHandle( module );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#getCommonProperties()
	 */
	public List getCommonProperties( )
	{
		List minProps = getMinPropDefns( );
		List commonProps = new ArrayList( minProps );
		Iterator iter = minProps.iterator( );
		while ( iter.hasNext( ) )
		{
			PropertyDefn propDefn = (PropertyDefn) iter.next( );
			for ( int i = 0; i < elements.size( ); i++ )
			{
				if ( !( (DesignElementHandle) elements.get( i ) ).getElement( )
						.getPropertyDefns( ).contains( propDefn ) )
				{