RadioButtonGroup.selection property does not work correctly

Steps to reproduce:
Add this code into your creationComplete event for an application:
/** RadioGroup to control selection of Overwrite || Create new Playlist */
private var radioGroup : RadioButtonGroup;
private var buttonOne : RadioButton;
private var buttonTwo : RadioButton;

public function onComplete() : void {
radioGroup = new RadioButtonGroup(this);

buttonOne = new RadioButton();
buttonOne.group = radioGroup;

buttonTwo = new RadioButton();
buttonTwo.group = radioGroup;

vGroup.addElement(buttonOne);
vGroup.addElement(buttonTwo);
radioGroup.selection = buttonOne;

Actual Results:
buttonOne does not appear to be selected

Expected Results:
buttonOne should show as selected to the user

Workaround (if any):

I guess set selection at a later point in time.
See the comments in the documentation here:

http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/spark/components/RadioButtonGroup.html