flex - Dynamically adding radiobuttongroup -

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i'm trying make quiz in flex , loading data xml file. each question want create radiobuttongroup can associate radio buttons it. how can accomplish actionscript? can see addchild method works displayobjects , presume radiobuttongroup not 1 because i'm receiving errors. how can dynamically add radiobuttongroup actionscript in flex application? thanks.

if add radio buttons formitem, automatically grouped together. so, assuming quiz uses flex form layout, generate formitem each question, add button each option formitem, add formitem main form.

private function generatequestions(questions:xml):void {     var form:form = new form();     this.addchild(form);      each (var question:xml in questions.question)     {         var questionitem:formitem = new formitem();         form.addchild(questionitem);         questionitem.label = question.@text;          each (var option:xml in question.option)         {             var optionbutton:radiobutton = new radiobutton();             optionbutton.label = option.@text;             questionitem.addchild(optionbutton);         } }

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