Australian building products ’minnow’ Barro Properties Pty Ltd remains tight-lipped about whether it will use its stake in cement and lime producer Adelaide Brighton Ltd to block a takeover bid by Boral Ltd.  In its target’s statement issued yesterday, Adelaide Brighton reiterated its recommendation that shareholders accept the $867 million takeover bid by building products group Boral. However, director Dave Barro, who has a significant interest in Adelaide Brighton, has refrained from making a recommendation.