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
aggOnList.add( name );
		}
		for ( Iterator iterator = columnLevelList.iterator( ); iterator.hasNext( ); )
		{
			String name = (String) iterator.next( );
			aggOnList.add( name );
		}
		for ( Iterator iterator = rowLevelList.iterator( ); iterator.hasNext( ); )
		{
			String name = (String) iterator.next( );
			for ( Iterator iterator2 = columnLevelList.iterator( ); iterator2.hasNext( ); )
			{
				String name2 = (String) iterator2.next( );
				aggOnList.add( name + "," + name2 ); 
			}
		}
		return (String[]) aggOnList.toArray( new String[aggOnList.size( )] );
	}
	private List getCrosstabViewHandleLevels( CrosstabReportItemHandle xtab,
			int type )
	{
		List levelList = new ArrayList( );
		CrosstabViewHandle viewHandle = xtab.getCrosstabView( type );
		if ( viewHandle != null )
		{
			int dimensions = viewHandle.getDimensionCount( );
			for ( int i = 0; i < dimensions; i++ )
			{
				DimensionViewHandle dimension = viewHandle.getDimension( i );
				int levels = dimension.getLevelCount( );