Tower defence, upgrading to level 2

Hello, Im working on a new game for some time now, I have run into a issue I cannot solve, I would really appreciate some good clear instructions on solving my issue. "After multiple towers and multiple upgrade buttons are spawned of the same tower and same upgrade button how do I upgrade my tower more than once"

I have my tower and upgrade button pinned and in container, when the tower and upgrade button is spawned I have the upgrade button read the UID of that tower,so I can upgrade the towers individually, this all seems to work fine, the issue I have is how do I use the same upgrade button to upgrade the tower to level 2, it seems when I click the button once it will upgrade that tower to level 1 and level 2 at once if there is enough coins.

If someone has a completely different way on upgrading towers without containers, I would love to see it.

Please be as clear as possible so I can implement your ideas, thank you in advance

So you're saying the issue is it upgrades two levels at once if there are enough coins? Then only allow it to increase one level at a time. Structure your events so that when you hit upgrade it increases the level by 1 only, regardless of amount of coins.

I'm trying but cannot figure it out. I'm hoping I get some help with my problem, I'm spending far to long on it, I tried many different things with no luck

You didn't share your current approach because it would only be a matter of tweaking that. You can have an instance variable for level and increase it by 1 every time you press upgrade, fairly simple.

Lionz, thank you for refreshing my mind, I should of know 1+1=2 :) , finally have it working now thanks to you.