Bug 390669 [Accessibility]Press 'Tab' doesn't focus on the next report item when adding relative period aggregation.
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/dialogs/CrosstabBindingDialogHelper.java
{
				if ( aggOns[j].equals( aggstr ) )
				{
					cmbAggOn.select( j );
					return;
				}
				if ( aggOns[j].equals( temAddOns ) )
				{
					cmbAggOn.select( j );
					return;
				}
			}
			cmbAggOn.select( 0 );
		}
		catch ( ExtendedElementException e )
		{
			ExceptionUtil.handle( e );
		}
	}
	private String[] getAggOns( CrosstabReportItemHandle xtabHandle )
	{
		List rowLevelList = getCrosstabViewHandleLevels( xtabHandle,
				ICrosstabConstants.ROW_AXIS_TYPE );
		List columnLevelList = getCrosstabViewHandleLevels( xtabHandle,
				ICrosstabConstants.COLUMN_AXIS_TYPE );
		List aggOnList = new ArrayList( );
		aggOnList.add( ALL );
		for ( Iterator iterator = rowLevelList.iterator( ); iterator.hasNext( ); )
		{
			String name = (String) iterator.next( );