Problem with loading options to radiobuttons in update form

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Well it seems that the referred post is mostly about the STRUCTURE of .options
My problem is about the ORDER of 1) loading options :

$w("myRadioButtons").options = fetchOptionsFromCollection();

and 2) setting the default value:

$w("myRadioButtons").value = fetchValueFromCollection();

Value setting is happening BEFORE loading of options, when there is no option to set yet.
For dropdowns I don`t even need to set the value, I just connect it to dataset in the editor and it works fine. But it doesn’t for radiobuttons and tags.

Or, in other words:
What is the correct (default, recommended, tidy, orthodox) method of loading options and setting values of a form input element?