All the File User Interface events are fired just before Solid Edge displays any dialog box that prompts the user for file information. Using these events, an application can override the Solid Edge dialog box and feed the needed information directly to the command. If such an event call-out returns with a file name or other file-related information, Solid Edge does not display its dialog box. Instead, it uses the information provided by the application to complete the file command. If you do not want to handle an event, return E_NOTIMPL so that Solid Edge proceeds as if no application was listening to the event and displays its dialog box. If you want to cancel the command, return S_OK (or S_FALSE) while returning all the strings as NULL strings so that Solid Edge proceeds to cancel the command without displaying its dialog box. If you return any other error, Solid Edge aborts the command just as it would when an error was received from a native method. If you return S_OK with valid output strings, Solid Edge uses the strings accordingly.
