Remove radiobuttongroup instances

I am trying to figure out how to get rid of radiobuttongroup instances in ActionScript3. I have created them dynamically via a loop using method like this:

PHP Code:

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rb_grp = newRadioButtonGroup(grpname); 


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I need to identify and remove/destroy each instance of the radiobuttongroup based on user action within my flash app? I have properly added RadioButtons to each of these dynamically created groups and have used AS3 methods/properties to remove them. Unlike RadioButton objects which are created via addChild and removed via removeChild, RadioButtonGroups do not have this method. Any help is greatly appreciated!