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
protected static final String DEFAULT_ITEM_NAME = Messages.getString( "BindingDialogHelper.bindingName.dataitem" ); 
	protected static final String DEFAULT_AGGREGATION_NAME = Messages.getString( "BindingDialogHelper.bindingName.aggregation" ); 
	private static final String DEFAULT_TIMEPERIOD_NAME = Messages.getString( "CrosstabBindingDialogHelper.bindngName.timeperiod" ); 
	private static final String CALCULATION_TYPE = Messages.getString( "CrosstabBindingDialogHelper.calculation.label" ); 
	private static final String CALCULATION_GROUP = Messages.getString( "CrosstabBindingDialogHelper.calculation.group" ); 
	private static final String EMPTY_STRING = ""; 
	protected static final IChoiceSet DATA_TYPE_CHOICE_SET = DEUtil.getMetaDataDictionary( )
			.getStructure( ComputedColumn.COMPUTED_COLUMN_STRUCT )
			.getMember( ComputedColumn.DATA_TYPE_MEMBER )
			.getAllowedChoices( );
	protected static final IChoice[] DATA_TYPE_CHOICES = DATA_TYPE_CHOICE_SET.getChoices( null );
	protected String[] dataTypes = ChoiceSetFactory.getDisplayNamefromChoiceSet( DATA_TYPE_CHOICE_SET );
	private Text txtName, txtFilter, txtExpression;
	private Text dateText;
	private Combo cmbType, cmbFunction, cmbAggOn, calculationType,
			timeDimension;
	private Composite paramsComposite;
	private Group calculationComposite;
	private Map<String, Control> paramsMap = new HashMap<String, Control>( );
	private Map<String, String> paramsValueMap = new HashMap<String, String>( );
	private Composite composite;
	private Text txtDisplayName, txtDisplayNameID;
	private ComputedColumn newBinding;
	private CLabel messageLine;
	private Label lbName, lbDisplayNameID;
	private Object container;
	private Button btnDisplayNameID, btnRemoveDisplayNameID;
	private List<ITimeFunction> times;
	private Button todayButton, dateSelectionButton, recentButton;
	private Label dateFormatLbl;