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The persisted content of the region contained within the System.Web.UI.Design.ContainerControlDesigner.
The System.Web.UI.Design.ContainerControlDesigner class implements a single designer region instead of a collection of designer regions. Therefore, the region parameter is ignored, and the ContainerControlDesigner.GetEditableDesignerRegionContent(EditableDesignerRegion) method returns the content for the single designer region that is contained in the control designer.