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: 25.0.0.0 (25.0.0.0)
public IFrameworkElementCreator FrameworkElementCreator { get; set; }
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.