Identifying which Radiobutton is selected through code

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@lillewill , this will execute the expand/collapse code only when the index of the radiogroup is 3. Keep in mind that 0 is the first option, 1 is the second option index, and so on.

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