Help about events on buttons creted at run time

in the HUD I created a empty scollbox and on the level blueprint I create the logic that adds new buttons inside the scrollbox, following this example

on the referenced button (the one’s that I duplicate at runtime) I cretead an onclick event on the Hud graph.
On the Hud graph I created a string var and on the click event I set the content of that variable. The Huge problem seems that it set the value of that variable like it was private!! infect I created anothe button that reads the value of that variable and it display the defalut value!!! I’m getting crazy, ther is no way from a created button event to comunicate with the other. Please help!