When a Property Editor is displayed in a read-only mode, in most cases the control's buttons should be invisible to prohibit end-user interaction. However, certain controls must have their buttons visible to provide the viewing functionality. These controls' repository item types are listed in the collection returned by this field. By default, this collection contains the following types: RepositoryItemImageEdit, RepositoryItemMemoExEdit, RepositoryItemRtfEditEx and RepositoryItemObjectEdit.
For internal use.