Gets a value indicating whether the control designer uses a temporary preview control to generate the design-time HTML markup.
Assembly: System.Design (in System.Design.dll)
If the property is true, the ViewControl property returns a temporary copy of the control. Changes to the temporary control are not persisted to the document.
The SupportsPreviewControl setting in the SupportsPreviewControlAttribute object is used to set the value of the property. Therefore, the SupportsPreviewControl setting determines the type of control that is returned by the ViewControl property in the base ControlDesigner class. If the SupportsPreviewControlAttribute is not specified in the control designer declaration, the ControlDesigner object behavior is equivalent to specifying the SupportsPreviewControl property as false.Notes to Inheritors
Custom designers that are derived from the ControlDesigner class can override the property and ignore the SupportsPreviewControlAttribute object. Generally, to indicate that the ViewControl property always returns a temporary copy of the control, override the property to always return true. To indicate that the ViewControl property always returns an instance of the control, override the property to always return false. For example, the PreviewControlDesigner class derives from the ControlDesigner and always returns true for the property.