Identifying which Radiobutton is selected through code

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@lillewill Sorry, I should have tested it. There are a couple syntax issues: 1) it needs a parenthesis after the 3 and 2) there should be a triple equals sign signifying that it is a conditional expression and not an assignment:

export function radiobuttongroup1_change(event) {  
 if ($w('#radiobuttongroup1').selectedIndex === 3) {    
 if ($w('#box').collapsed) {          
       $w('#box').expand();     
    } else {            
       $w('#box').collapse(); 
    }
  }
}