Bug 184762 BIRT Model - Enhancments to the level defintion
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/de/CrosstabItemFactory.java
if ( AGGREGATION_CELL_EXTENSION_NAME.equals( extensionName ) )
			return new AggregationCellHandle( extendedItemHandle );
		if ( CROSSTAB_MEMBER_VALUE_EXTENSION_NAME.equals( extensionName ) )
			return new CrosstabMemberValueHandle( extendedItemHandle );
		
		
		return null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.extension.IMessages#getMessage(java.lang.String,
	 *      java.util.Locale)
	 */
	public String getMessage( String key, Locale locale )
	{
		return Messages.getString( key, ULocale.forLocale( locale ) );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.extension.IMessages#getMessage(java.lang.String,
	 *      com.ibm.icu.util.ULocale)
	 */
	public String getMessage( String key, ULocale locale )
	{
		return Messages.getString( key, locale );
	}
}