HierarchicalListPlugIn:

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   Create and manages a hierarchical list. Each element of the list is

   h(k).name        = 'mike';
   h(k).parent      = '';
   h(k).child       = {'pete'};
   h(k).data        = ...;         Data can be anything.

   Initialize
   ----------
   tag = HierarchicalListPlugIn( 'initialize', h, figureHandle, position, callback )

   API
   ---
   HierarchicalListPlugIn( 'add',    tag, h ) % Parent can be empty
   HierarchicalListPlugIn( 'delete', tag )
   HierarchicalListPlugIn( 'show',   tag )
   HierarchicalListPlugIn( 'hide',   tag )
   HierarchicalListPlugIn( 'set',    tag, d )
   
   d   = HierarchicalListPlugIn( 'get', tag ) % Gets the entire list

   Get the name of the selected element
   s   = HierarchicalListPlugIn( 'get selection', tag )
   s   = HierarchicalListPlugIn( 'get data for selection', tag )
   s   = HierarchicalListPlugIn( 'get list', tag )

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   Form:
   x = HierarchicalListPlugIn( action, modifier, hFig, position, callback, params )
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   ------
   Inputs
   ------
   action      (1,:)  Action 'initialize', 'update'
   modifier    (1,:)  Modifier to the action
   hFig        (1,1)  Handle to the figure
   position    (1,4)  [left bottom width height]
   callback    (1,:)  Callback string when something has changed in this gui
   params      {:}    Parameter pairs for the list uicontrol

   -------
   Outputs
   -------
   x           (1,1)  Depends on the action.

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Children:

Common: General/DeBlankLT
Common: General/GetListString