Hello S. Webb,
HtmlContentEditor is obsolete and you should use wrapper for GenericContent
if you use Sitefinity 3. 6 or 3.7 editions or WebUIEditor that wraps RadEditor
( this is an example with RadTreeView)
IGenericContent is generally used when you use a user control, but GenericContent control does not work properly as a user control and the solution is a wrapper for GenericContent
Let me know if there are further question.
the Telerik team
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