Enabling/Disabling TDBRadioGroup Items individually

I am using a TDBRadioGroup component with four possible values (Items). I
would like to selectively disable (greyed and non selectable) and enable
these displayed Item values individually.

EX: With the possible alternatives being Red, Yellow, Blue and Green. I
would like to be able to temporarily disable Blue and Green so that they
cannot be selected, but leave them visible within the group so that the
user can see that they may still be options at another time...

How can this be done??

John Johnson
Marketing Director, OPTEK