How do I set a variable in separate widget class from custom button widget class in ue4 blueprint - unreal-engine4

attached are my current blueprints. i have a widget that is the level select screen, which will contain instances of a level select button. depending on which button is clicked, i want it to update a variable in the level select widget which stores the level from that particular button. I'm trying to do this so that i can add or remove levels from the selector in a modular way, as well as because there will be an option to select multiple levels played one after the other.
https://i.gyazo.com/71731a6682b186b0e1b874a80144677c.png is the button code, when clicked it will take the editor value as an int, and (when working properly) send that to the level select code which is pictured here https://i.gyazo.com/277e54770aa1a70bdab083f8b98aa714.png, selecting the proper level based on the value of variable 'selected level' when the 'proceed' button is clicked.

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Solutions I tried
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The source code is also available at Github-Repo
Thanks all someone at linkedin helped me with the solution. which is
We have to wrap the AlertDialog with StatefulBuilder and have to call setState when option is selected then it will work.

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