RadioButtonSet.Select() does not invoke RadioButtonSet.OnUserinput()

RadioButtonSet.Select() does not invoke RadioButtonSet.OnUserinput()

Hi,

I have a radio button set.

I'm using the .Select() statement to programatically select a radio button option.
I'm expecting that when I do this that the code behind the radio button's field action OnUserinput() will be called. But this is not happening.

Once I issue the .Select() how can I invoke the OnUserinput()?
Obviously when I use .Select() I'm expecting that it would behave as though the user had selected that option.

Any ideas or workarounds?

Thanks,
Tony.