Bug 161186 Effects in viewer and PDF are not the same
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFAbstractLM.java
{
		IReportExecutor executor;
		public ReportStackingExecutor( IReportExecutor executor )
		{
			this.executor = executor;
		}
		public void close( )
		{
			executor.close( );
		}
		public IContent execute( )
		{
			return null;
		}
		public IReportItemExecutor getNextChild( )
		{
			return executor.getNextChild( );
		}
		public boolean hasNextChild( )
		{
			return executor.hasNextChild( );
		}
	}
	protected boolean checkAvailableSpace( )
	{
		if ( parent != null )
		{
			int leftHeight = parent.getMaxAvaHeight( ) - parent.getCurrentBP( );