Check Box Problem/Bug?

Kind of busy last night, so I didn’t have a chance to mess with this much, but I’m back on it tonight. I’m still trying to implement the method you shared in UMG Toggle Buttons - #6 by Everynone. More importantly, I’m trying to understand it … and more or less I’m getting there.

Ignore this part: I figured it out
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However, I’ve encounter another problem. In the second pic, you have a custom event called ED_MyStates_Event_0. I can create a custom event, but I can’t add the “Check Box Reference” to it, which makes me think this is not just a custom event I create there on the spot. I don’t know how to make this node.

Where is the “lastChecked” set up?

Ok, got those things figured out and this mess sort of works. I can click one checkbox and it checks. I click a second box and the first one unchecks. Yay … until I click a third one. The second one does not uncheck. Clicking a forth leaves 2, 3, and 4 checked.
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Also, is it possible to set a “default”? I’d like the first box to be checked automatically.

Also, in the interest of understanding things: In the wCustomCheckbox you’re calling the ED_My_States and passing the Is Check value to it, but then not using that value on the Custom Event in the main widget. I’m curious about that.

I’ll play around with this stuff and hopefully figure it out. I’m still not nearly 100% on the understanding of what’s going on here and that bugs me. I don’t want to just copy what you did, I want to understand the why of it.

Thanks.