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Setting defaults for radio buttons


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It errors when you are building a radio button, & possibly other controls, and want to pre-assign whether it is checked, before showing it or connecting / adding it to a container (_host).  You get a  'executeOnAllControls' of undefined, here.  I am getting around this by directly assigning _isChecked.  Since this is being written in typescript & that is private it must be:

radio["_isChecked"] = true;

Thinking, checking if _host is not null might be a good idea.  True, you could screw it up by checking multiples of the same group in initialization, but it should be obvious that this is developer error.

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