Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ThemeRecord.java
*/
	public NotificationEvent getEvent( )
	{
		return new ThemeEvent( module );
	}
	/**
	 * Unresolves references of styles of a theme.
	 * 
	 * @param theme
	 *            the theme
	 */
	private void updateStyles( ElementRefValue theme )
	{
		
		if ( theme == null )
			return;
		if ( !theme.isResolved( ) )
			return;
		Iterator iter = new LevelContentIterator( module, new ContainerContext(
				theme.getElement( ), IThemeModel.STYLES_SLOT ), 1 );
		while ( iter.hasNext( ) )
		{
			DesignElement element = (DesignElement) iter.next( );
			assert element instanceof StyleElement;
			ReferenceableElement referenceableElement = (ReferenceableElement) element;
			referenceableElement.updateClientReferences( );
		}
	}
}