Check “Is Variable” in the designer tab for your second vertical box. When you create a custom navigation function for whichever key or direction you want (presumably left), drag out and “Get” the vertical box variable (in the below screenshot that vertical box is the “Attribute Picker Box”.
Then drag out and “Get All Children”.
From the return value drag out and “Get a Copy”. If you leave the number to 0, it will automatically get the first widget/button it can focus on in the vertical box.
Then drag out the “Set Focus” and make the target the result from “Get a Copy”. It should end up looking something like the photo.
If you need to expand upon it any, I’m pasting a link to the tutorials that helped me get through it. Its the third out of four videos, but this is the one that goes through this particular functionality. Hope this helps!
