[Newbies] Easy way to define new methods referenced in a method?

[Tim M]

Is there an easy way to define methods when you reference them in a new method?

e.g. 
 
renderContentOn: html

  html heading: 'ToDo-List'.
  html div
  class: 'menu';
  with: self menuComponent.


When I save it warns me that menuComponent isn't defined but there is no 
option to define a stub method for it? So I simply select that its correct. 
Then in the new method there is no refactor operation to implement that method 
(in Dolphin I can select the AutoCorrect menu and there is a define method 
option - is there some addin for Squeak that does this? Or does everyone 
rely on having a test that calls the method and so you let the debugger define 
it?)

Tim