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The System.Web.UI.Design.ControlDesigner class is read-only, by nature. Read/write features are provided by adding a System.Web.UI.Design.DesignerRegion object or using base classes, such as the System.Web.UI.Design.ContainerControlDesigner class.
The ControlDesigner.ReadOnly property is obsolete. Derive from the System.Web.UI.Design.ContainerControlDesigner class to which you can add editable designer regions or from the System.Web.UI.Design.TemplatedControlDesigner object to which you can create editable designer regions in templates.