.enaml

from enaml.stdlib.fields import IntField

enamldef PersonForm(Form):
    attr person
    Label:
        text = 'First Name'
    Field:
        value := person.first_name
    Label:
        text = 'Last Name'
    Field:
        value := person.last_name
    Label:
        text = 'Age'
    IntField:
        value := person.age


enamldef PersonView(MainWindow):
    attr person
    PersonForm:
        person = parent.person

.py

from traits.api import HasTraits, Str, Range, on_trait_change

class Person(HasTraits):
    """ A simple class representing a person object."""
    last_name = Str
    first_name = Str
    age = Range(low=0)

    @on_trait_change('age')
    def debug_print(self):
        """ Prints out a debug message whenever the person's age changes """
        templ = "{first} {last} is {age} years old."
        print templ.format(first=self.first_name,
                           last=self.last_name,
                           age=self.age)

if __name__ == '__main__':
    import enaml
    with enaml.imports():
        from person_view import PersonView
    john = Person(first_name='John', last_name='Doe', age=42)
    view = PersonView(person=john)
    view.show()

Resultado