The contextual help associated with the pane. 
   Namespace:   Autodesk.Revit.UI  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 16.0.0.0 (16.0.0.0) 
  Since:  2016 
Syntax
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Remarks
 If set, the contents of this Contextual Help will be used to respond to a user request for help (typically this is as a result of pressing F1 while the dockable pane has focus).