Using GWT Editors with a complex usecase

I'm trying to create a page which is very similar to the Google Form creation page.

This is how I am attempting to model it using the GWT MVP framework (Places and Activities), and Editors.

CreateFormActivity (Activity and presenter)

CreateFormView (interface for view, with nested Presenter interface)

CreateFormViewImpl (implements CreateFormView and Editor< FormProxy >

CreateFormViewImpl has the following sub-editors:

• TextBox title
• TextBox description
• QuestionListEditor questionList

QuestionListEditor implements IsEditor< ListEditor< QuestionProxy, QuestionEditor>>

QuestionEditor implements Editor < QuestionProxy> QuestionEditor has the following sub-editors:

• TextBox questionTitle
• TextBox helpText
• ValueListBox questionType
• An optional subeditor for each question type below.

An editor for each question type:

TextQuestionEditor

ParagraphTextQuestionEditor

MultipleChoiceQuestionEditor

CheckboxesQuestionEditor

ListQuestionEditor

ScaleQuestionEditor

GridQuestionEditor

Specific Questions:

1. What is the correct way to add / remove questions from the form. (see follow up question)
2. How should I go about creating the Editor for each question type? I attempted to listen to the questionType value changes, I'm not sure what to do after. (answered by BobV)
3. Sho