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This property indicates whether a template editor can be invoked from a component of a parent template editor's templated control. This is called nested template editing, because a template editor is invoked for a component of a control for which a template editor is already operating.
The System.Web.UI.Design.ITemplateEditingService interface is obsolete. Expose templates through the ControlDesigner.TemplateGroups property of a control designer. The design host creates a System.Web.UI.Design.TemplatedEditableDesignerRegion for each System.Web.UI.Design.TemplateGroup defined for a control designer.