EditScroll:

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   Implement a scrollable edit window
   tag = EditScroll( 'initialize', text, hFig, [10 10 200 100] )
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   Form:
   x = EditScroll( action, modifier, hFig, position )
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   ------
   Inputs
   ------
   action    (1,:)    Action to perform
   modifier  (1,:)    Modifier to the action
   hFig      (1,1)    Figure handle
   position  (1,4)    [left, bottom, width, height]

   -------
   Outputs
   -------
   x         (:,:)    The text

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