code: public boolean renderPickedItemStack(ItemStack itemStack)
  	{
  		if (itemStack == null || itemStack == ItemStack.EMPTY)
  			return false;
  
  		int size = itemStack.getCount();
  		String label = null;
  		if (size == 0)
  		{
  			itemStack.setCount(size != 0 ? size : 1);
  			label = TextFormatting.YELLOW + "0";
  		}
  
  		itemRenderer.zLevel = 100;
  		drawItemStack(itemStack, MalisisGui.MOUSE_POSITION.x() - 8, MalisisGui.MOUSE_POSITION.y() - 8, label, null, false);
  		itemRenderer.zLevel = 0;
  		return true;
  	}
docs: Render the picked up itemStack at the cursor position.
  
  @param itemStack the item stack