Good news, if you want, you can checkout lastest development sources of Kuix on the SVN. And then try to use the new Choice widget.
Look hat this thread for changelog.
A Choice is an extension to a classic RadioGroup.
Usage :
...
<choice>
<radioGroup onChange="myOnChangeAction(this.value)">
<RadioButton value="1" selected="true">Choice 1</radioButton>
<RadioButton value="2">Choice 2</radioButton>
</radioGroup>
</choice>
...
The radioGroup is displayed in a new Screen only whan you pressed or clicked the choice widget.
This widget is currently in debug state.