Radios Group with reserved option

Dear all,
is it possible to define a RadiosGroup having, for instance, 2 public options and 1 option for registered users only?
I wan't assign permissions to the RadiosGroup object but to its options
Any suggestion?
Regards

Turn on permissions on your form and have two PHP blocks, one with public permissions and one with registered permissions, in that order.
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In the first one build your options (a value=>label array) and return it. In the second one, use $this->get("firstphpblockname") and add the registered options to the array.

Dear all,
It seems permissions have been removed from the latest version.
I can't find permissions on php section anymore.
Is it a bug?
Regards

They need to be turned on, under the main Settings tab

Permissions are at "event" level.
In the previous versions, permissions were at "PHP block" level.
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On 15 january you told me to put 2 php blocks, one with public, one with registered permissions.
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I need permissions at PHP block level.
Have you removed them?
Regards

I'm not the developer, I didn't remove anything. But the permissions now need to be activated under the main SETTINGS tab.

Thanks