Bug 312761 It makes no difference changing the series labels position in Radar chart.[13]
chart/org.eclipse.birt.chart.ui/src/org/eclipse/birt/chart/ui/util/ChartUIUtil.java
if ( bIgnoreNotification )
			{
				ChartAdapter.endIgnoreNotifications( );
			}
		}
	}
	
	/**
	 * Check if it just allows category expression as category sort key. When Y
	 * optional expressions is specified and not sharing/cube cases, the Y
	 * optional will be top group and category expression will be the second use
	 * category expression as the sort key.
	 * 
	 * @param wizardContext
	 * @return result
	 * @since 2.5.3
	 */
	public static boolean hasLimitOnCategorySortKey( ChartWizardContext wizardContext )
	{
		int stateInfo = wizardContext.getDataServiceProvider( ).getState( );
		boolean isCube = ( stateInfo & IDataServiceProvider.HAS_CUBE ) == IDataServiceProvider.HAS_CUBE
				&& ( stateInfo & IDataServiceProvider.SHARE_QUERY ) != IDataServiceProvider.SHARE_QUERY;
		if ( ChartUtil.isSpecifiedYOptionalExpression( wizardContext.getModel( ) ) && !isCube )
		{
			return true;
		}
		return false;
	}
}