SISOListPlugIn:

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   Create a list of SISO elements for use by control design tools.
   Allows the user to input parameters.

   Typing SISOListPlugIn is the same as SISOListPlugIn('initalize')
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   Form:
   x = SISOListPlugIn( action, modifier, hFig, position, callback )
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   ------
   Inputs
   ------
   action      (1,:)  Action 'initialize', 'update'
   modifer     (1,:)  Modifier to the action or data structure if intialization
   hFig        (1,1)  Handle to the figure or if 'update' radio button handles
   position    (1,4)  [left bottom width height]
   callback    (1,:)  Callback string when something has changed in this gui

   -------
   Outputs
   -------
   x           (1,1)  The tag if action is 'initialize'

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Children:

Common: ControlGUI/ControlDesignGUI
Common: General/GetListString
Common: General/GetNewTag