Removing Items from a shop?

For an Aos map, Im trying to setup a research "Shop" For each team, to research upgrades for their teams units.

The idea is that a Player can buy a research upgrade.
So I made dummy items in a shop, that are meant to be replaced by the next level when bought.

The Shop abilities are:
Select Hero, Sell Items, Invulnerable, Sell units, Shop Purchase Item.

Here is the trigger.


It adds the next level dummy item fine, but it does NOT remove the just bought item??

Help please.
thx
Fulla

Actually, I was fiddling with this idea before.
The only way to remove the items in that way is to first add them in that way.

So try at map initialization adding the first level of the item dummies to whatever shop, then when you get the first level, removing the first level and adding the second, etc.

That should work.
If not... Well you could always destroy the shop and readd the proper items based on variables.

Ah thx, it works now :-)