Applies To: CheckBox | Collection Class | Column | ComboBox | CommandButton | CommandGroup | Container Object | Control Object | CursorAdapter Class | Custom | EditBox | Exception Class | Form | FormSet | Grid | Header | Image | Label | Line | ListBox | OLE Bound Control | OLE Container Control | OptionButton | OptionGroup | Page | PageFrame | ProjectHook Object | ReportListener Object | _SCREEN | Session Object | Shape | Spinner | TextBox | Timer | ToolBar

In the Class Designer, the ParentClass property contains the name of the class on which the subclass's class is based.