Opening an interactable window clicking on an instance

[Lucouss]

Hello guys,

In my game I have objects (upgradable "turrets"), if I click on those it opens a new tab that lets me upgrade the clicked one. To do that I wrote this code:

pTurret - Left Pressed:

_id = instance_position(mouse_x, mouse_y, pTurret);
instance_create_layer(1056, 576, "Instances", oTab);

oTab - Left Pressed:

with(pTurret._id) {
    // Do stuff
}

But doing so, it keeps the id of the first turret created.
So I tried to fix that, moving the id_get in the Step Event:

pTurret - Step Event

if(mouse_check_button(mb_left)) {
    _id = instance_position(mouse_x, mouse_y, pTurret);
}

This works better, but now I have another problem: if I click on the tab it's like I click on the instances under the window too.
I don't want to deactivate instances in that region because it generates errors using those ids.

I have no idea how to fix this, maybe using a variable. But I tried in that way and it didn't work, could you guys help me? Thanks!

 

[Nidoking]

Mandatory reading: What's the difference between objects and instances?

Never use object dot variable syntax. Always get the ID of the instance you want, then use that with the dot and the variable name.