public abstract class ASPxWebControl :
    ASPxWebControlBase,
    INamingContainer,
    IPostBackDataHandler,
    IPostBackEventHandler,
    ICallbackEventHandler,
    IComponentHost,
    IWebControlObject,
    IClientObjectOwner,
    ISkinOwner,
    IPropertiesOwner,
    IPostBackDataHandlerEx,
    IPostDataCollection,
    IHandleCallbackError

Public MustInherit Class ASPxWebControl
    Inherits ASPxWebControlBase
    Implements INamingContainer,
               IPostBackDataHandler,
               IPostBackEventHandler,
               ICallbackEventHandler,
               IComponentHost,
               IWebControlObject,
               IClientObjectOwner,
               ISkinOwner,
               IPropertiesOwner,
               IPostBackDataHandlerEx,
               IPostDataCollection,
               IHandleCallbackError