public void StartTrade(Inventory playerInv, Inventory npcInv)
{
this.playerInv = playerInv;
this.npcInv = npcInv;
playerTradingItems = new Dictionary <InventoryItemRef, int>();
npcTradingItems = new Dictionary <InventoryItemRef, int>();
InterfaceController.AddMask(this, true);
UpdateTrade();
}