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
ExpressionButton button = (ExpressionButton) dateText.getData( ExpressionButtonUtil.EXPR_BUTTON );
			if ( button != null )
				button.refresh( );
			dateFormatLbl.setText( getDateHintText( ) );
			return true;
		}
		else if ( DesignChoiceConstants.REFERENCE_DATE_TYPE_ENDING_DATE_IN_DIMENSION.equals( type ) )
		{
			if ( getBinding( ) == null && !inUseDimsion )
			{
				return false;
			}
			else
			{
				recentButton.setSelection( true );
				return true;
			}
		}
		return false;
	}
	private void initTimeDimension( )
	{
		String[] strs = getTimeDimensions( );
		if (strs == null)
		{
			return;
		}
		timeDimension.setItems( strs );
		if ( getBinding( ) == null )
		{