*
* @return the background shape for this sheet.
*/
public Background getBackground(){
if (_background == null){
PPDrawing ppdrawing = getPPDrawing();
EscherContainerRecord dg = (EscherContainerRecord)ppdrawing.getEscherRecords()[0];
EscherContainerRecord spContainer = null;
List ch = dg.getChildRecords();
for (Iterator it = ch.iterator(); it.hasNext();) {
EscherRecord rec = (EscherRecord)it.next();