They can't, they don't have next year's 1st due to the Bobby Ryan deal.
This situation happened with ottawa's Mezaroes and Tampa. Tampa offered Mezaroes a contract which was above what the senators were willing to pay but unfortunately tampa had traded there i believe second to San Jose. Ottawa instead of trying to work out a deal with Mezaroes arranged a trade for kuba-picard and a pick. Mezaroes ended up sucking in Tampa well there team ended up selecting Victor Headman. Before ageeing on a deal to trade kuba for mezaroes Tampa tried to reaquire its pick from San Joes so they could just offer compensation. Unfortunately San Joes was unwilling to trade the pick.