Building a field control is just a special case of building a normal Sitefinity CMS widget. You just have to inherit from FieldControl rather than SimpleView. You can build your field control manually in code, or use Sitefinity CMS Thunder to generate a scaffold for you.
To read about creating field controls using Sitefinity CMS Thunder, you can read the Thunder: Field controls. This section discusses building a field control manually in code.
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