[Flex 4.5.1] How to prevent Radio Button from being selected when clicked on? No Changing Event?

I have a very common use case where you have a few radio buttons and only one can be selected at a time. Some of them are basic and on click should be selected right away, but other are more complex and open a pop up which requires some additional user selections after which the user selected OK or CANCEL for example and only after that the selection of the radio button should be applied programatically.
So to solve this issue I've come up with 2 workarounds:
1) make the entire group, that holds the radio button, act as a button with buttonMode="true" mouseChildren="false" and programatically change the radio button within it.
2) hold the current radio button selection in a variable and in the changeHandler of that radio button return the selection back to what was selected before. But this also causes a small flickering of the radio button which gets selected and deselected immediately after that.. not cool.
So my question is... is there something I am missing that could do the job without these workarounds... like a Changing event which I use for the ButtonBar but I can't find on the RadioButton or RadioButtonGroup... thanks!

Hi,thanks for the reply. Actually that was my third option, but not sure if it's very good also..
Here is a simple scenario:
User must select between 2 radio buttons:
1) no volume -> sets variable volume=0 and selects the radio button (that is the normal use case)
2) set volume -> opens up a pop up with a list that has a X button to close and 4 options: 25% volume, 50% volume, 75%, 100%
At this point the set volume radio button should not be selected and the user has 2 choices:
-> hit the X button to close - nothing changes and no volume radio button is still selected and volume is still = 0
-> hit one of the volume % buttons -> the set volume radio button gets selected and the variable volume=25/50/75/100 depending on the button selected by the user.
That's a pretty common scenario and it's bugging me that I can't easily alter the radio button selection logic since whenever I click it, it gets selected and I can't put a logic in between in a standard way. This should apply to any component with selection, just like ButtonBar has it with the Changing event.
So is there any other more convenient way to accomplish this scenario that you could recommend?
Thanks!

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[Flex 4.5.1] How to prevent Radio Button from being selected when clicked on? No Changing Event?

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