Bug 178519 Problems in multi-rows header
Please see the attachments.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFBlockStackingLM.java
}
			}
		}
		return false;
	}
	protected IReportItemExecutor createExecutor( )
	{
		return new BlockStackingExecutor( content, executor );
	}
	private boolean layoutChildNode( IReportItemExecutor childExecutor )
	{
		boolean hasNextPage = false;
		IContent childContent = childExecutor.execute( );
		PDFAbstractLM childLM = getFactory( ).createLayoutManager( this,
				childContent, childExecutor );
		hasNextPage = childLM.layout( );
		if ( hasNextPage && !childLM.isFinished( ) )
		{
			child = childLM;
		}
		return hasNextPage;
	}
	protected void initialize( )
	{
		if(root==null)
		{
			createRoot( );
			validateBoxProperty( root.getStyle( ), parent.getCurrentMaxContentWidth( ),
					context.getMaxHeight( ) );
			calculateSpecifiedWidth( );