DeclarativeCatalogPart

The DeclarativeCatalogPart control provides a way for developers to add a set of server controls declaratively to a catalog on a Web page. A catalog, in the Web Parts control set, is simply a list of WebPart or other server controls that is visible when a page is in catalog display mode. A user can select controls from the list and add them to the Web page, which effectively gives users the ability to change the set of controls and the functionality on a page.

The most common and convenient way to add a DeclarativeCatalogPart control to a page is by declaring it in page persistence format inside a CatalogZone