code: public void createFieldEditors() {
  		addField(new StringFieldEditor(PreferenceConstants.CLIENT_ID, "Google API Client Id:", getFieldEditorParent()));
  		addField(new StringFieldEditor(PreferenceConstants.CLIENT_SECRET, "Google API Client Secret:", getFieldEditorParent()));
  	}
docs: Creates the field editors. Field editors are abstractions of
  the common GUI blocks needed to manipulate various types
  of preferences. Each field editor knows how to save and
  restore itself.