code: public static void updatePickedItemStack(ItemStack itemStack, EntityPlayerMP player, int windowId)
  	{
  		Packet packet = new Packet(PICKEDITEM, windowId);
  		packet.draggedItemStack(itemStack);
  		MalisisCore.network.sendTo(packet, player);
  	}
docs: Sends a {@link Packet} to player to update the picked {@link ItemStack}.
  
  @param itemStack the item stack
  @param player the player
  @param windowId the window id