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 null;
		}
		
		public void removeFirst()
		{
			if(!cache.isEmpty( ))
			{
				cache.removeFirst( );
			}
		}
	
	}
	
	public void autoPageBreak()
	{
		if(!isRootEmpty( ))
		{
			return;
		}
		else if(!keepWithCache.isEmpty( ))
		{
			clearCache( );
			if(!isRootEmpty( ))
			{
				closeLayout();
				submitRoot();
				return;
			}
		}