Bug 184762 BIRT Model - Enhancments to the level defintion
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
* 
	 * @param obj
	 *            the container element
	 * @param slot
	 *            the slot to write
	 * @param tag
	 *            the optional list tag that encloses the list of contents
	 */
	protected void writeArrangedContents( DesignElement obj, int slot,
			String tag )
	{
		List list = obj.getSlot( slot ).getContents( );
		if ( list.isEmpty( ) )
			return;
		LinkedList newList = new LinkedList( );
		Iterator iter = list.iterator( );
		while ( iter.hasNext( ) )
		{
			DesignElement element = (DesignElement) iter.next( );
			DesignElement parent = element.getExtendsElement( );
			if ( !newList.contains( element ) )
			{
				newList.add( element );
			}
			if ( parent != null && list.contains( parent ) )
			{
				if ( !newList.contains( parent ) )
				{
					int index = newList.indexOf( element );
					newList.add( index, parent );