Description of problem:
UIs will require a lot of features that are not currently covered by the version of the form modeler. 

Implementators will certainly request to add their own fields or form controls to perform custom tasks. Current programming interface to do that is complex, and therefore, a simpler version is required.

Develop a simple custom type that a customer can plug a custom implementation of a simple base class or interface to hook into the form lifecycle for binding, rendering and validation.