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
{
		List<String> datas = getMesures( );
		datas.addAll( getDatas( ) );
		String[] items = datas.toArray( new String[datas.size( )] );
		cmbDataField.setItems( items );
		if ( paramsValueMap.containsKey( param.getName( ) ) )
		{
			cmbDataField.setText( paramsValueMap.get( param.getName( ) ) );
			return;
		}
		if ( binding != null )
		{
			for ( Iterator iterator = binding.argumentsIterator( ); iterator.hasNext( ); )
			{
				AggregationArgumentHandle arg = (AggregationArgumentHandle) iterator.next( );
				if ( arg.getName( ).equals( param.getName( ) ) )
				{
					if ( arg.getValue( ) != null )
					{
						for ( int i = 0; i < items.length; i++ )
						{
							if ( items[i].equals( arg.getValue( ) ) )
							{
								cmbDataField.select( i );
								return;
							}
						}
						cmbDataField.setText( arg.getValue( ) );
						return;
					}