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 ( CrosstabAdaptUtil.isTimeDimension( dimension ) )
		{
			DimensionViewHandle viewHandle = getCrosstabReportItemHandle( ).getDimension( dimension.getName( ) );
			if ( viewHandle == null )
			{
				int count = dimension.getDefaultHierarchy( ).getLevelCount( );
				if ( count == 0 )
				{
					return false;
				}
				LevelHandle levelHandle = dimension.getDefaultHierarchy( )
						.getLevel( 0 );
				if ( DesignChoiceConstants.DATE_TIME_LEVEL_TYPE_YEAR.equals( levelHandle.getDateTimeLevelType( ) ) )
				{
					return true;
				}
			}
			else
			{
				int count = viewHandle.getLevelCount( );
				if ( count == 0 )
				{
					return false;
				}
				LevelViewHandle levelViewHandle = viewHandle.getLevel( 0 );
				if ( DesignChoiceConstants.DATE_TIME_LEVEL_TYPE_YEAR.equals( levelViewHandle.getCubeLevel( )
						.getDateTimeLevelType( ) ) )
				{
					return true;
				}