Do not make it as single form. As you can see from attached image it is combination of multiple layouts. So break it down to the sections that will be easier to manage, build them and at the end combine this section to single item
Actually your question has nothing specific to RadioButton it will be the same for any component. As peter_budo mentionned, you have probably a lot of different layouts in that application.
Which one gives you the problem ? Which RadioButton is not a the good place ?
Post the code for that particular button.