[CONNECT C++] Trying to use DetailingSymbolBaseHandler

I'm trying to use DetailingSymbolBaseHandler:

DetailingSymbolBaseHandler		*detailingSymbolBaseHandler = dynamic_cast<DetailingSymbolBaseHandler*>(&eeh.GetHandler());
if (detailingSymbolBaseHandler)	// supports ITextEdit
{
wprintf(L"Support for DetailingSymbolBaseHandler not implemented yet\n");
}

but the compiler complains when I include:

#include <DgnPlatform\DetailingSymbol\DetailingSymbol.h>

1>C:\Program Files\Bentley\MicroStationCONNECTSDK\include\DgnPlatform/ViewElementHandlerSubTypes.h(47): error C3646: 'GetCalloutType': unknown override specifier
1>C:\Program Files\Bentley\MicroStationCONNECTSDK\include\DgnPlatform/ViewElementHandlerSubTypes.h(47): error C2275: 'Bentley::ElementHandleCR': illegal use of this type as an expression
1> C:\Program Files\Bentley\MicroStationCONNECTSDK\include\DgnPlatform\DgnPlatform.h(258): note: see declaration of 'Bentley::ElementHandleCR'
1>C:\Program Files\Bentley\MicroStationCONNECTSDK\include\DgnPlatform/ViewElementHandlerSubTypes.h(47): error C2146: syntax error: missing ')' before identifier 'viewEl'
1>C:\Program Files\Bentley\MicroStationCONNECTSDK\include\DgnPlatform/ViewElementHandlerSubTypes.h(47): error C2238: unexpected token(s) preceding ';'

I also tried to include:

#include <DgnPlatform\DetailingSymbol\DetailingSymbolHandlers.h>

but that had more "errors"..

Bruce