A creator that will be called for the pane if the FrameworkElement is not set. 
   Namespace:   Autodesk.Revit.UI  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2018 
Syntax
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Remarks
 This is more dynamic in nature and allows for embedding things like WebBrowser controls that cannot be cached for reuse in each pane invocation but rather needs creating each time.