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
protected void closeExecutor( )
	{
		if ( executor != null )
		{
			executor.close( );
		}
	}
	protected abstract boolean layoutChildren( );
	public boolean isFinished( )
	{
		return status == STATUS_END;
	}
	protected boolean allowPageBreak( )
	{
		return true;
	}
	public PDFStackingLM getParent( )
	{
		return this.parent;
	}
	protected PDFLayoutManagerFactory getFactory( )
	{
		return context.getFactory( );
	}
	protected boolean isPageBreakBefore( )
	{
		if ( canPageBreak( ) )
		{
			return needPageBreakBefore( );
		}