Closed Unassigned: HTMLEditor [27807]

Has the htmleditor been removed in the ajax control toolkit v15.1? If I try to add the below code to the page, I get the error "The type or namespace name 'HTMLEditor' does not exist in the namespace 'AjaxControlToolkit'". When I look at the sample site code, the HTML Editor Extender is there, but I don't see the HTML Editor.

<%@ Register
Assembly="AjaxControlToolkit"
Namespace="AjaxControlToolkit.HTMLEditor"
TagPrefix="HTMLEditor" %>