This event allows loading data from field in your own format.
TRVCustomFormatEvent = procedure (Sender: TCustomRichView;
Stream: TStream; var DoDefault: Boolean) of object;
property OnLoadCustomFormat: TRVCustomFormatEvent;
(introduced in version 10)
Stream contains data from DataField. Data should be loaded from Stream to Sender.
DoDefault is True.
If data are loaded successfully, set DoDefault to False, otherwise the component will attempt to load RVF/RTF/text.