Hi man,
As you can see from the upper image, you can use the method B.
That works like this.
Inside your widget add a Boxwidget, and be sure to go in the detail of that box
and set it as a variable, like in the image.
Now you can place any number of buttons inside, (you can do it also by nodes ingame!)
And in the eventgraph you can get a reference to all the buttons, using the nodes in the Commented B.
So get a reference to the Box you created and use the node get all children.
from this you can use the node ForEachLoop to do an action for every child inside…
And as you can see, you can add all of them to a variable array, using add.
so you always able to do an action on all of them by that variable +foreachnode
Let me know if i can help you more @Curnow42