Getting ViewContext from IViewManager

Hi guys,

 On including the IViewManager.h to my application i got this error msg.

 C:\PROGRA~1\Bentley\MICROS~1\MICROS~1\mdl\MicroStationAPI\interface\IViewManager.h(126) : error C2061: syntax error : identifier 'IRedrawOperation'

I checked the function in the documentation and its like this

void DoElementAgendaDynamics (ElementAgendaP, IRedrawOperation *, ClipDescrP)

and in the header file its like this

MSCORE_EXPORT void DoElementAgendaDynamics (ElementAgendaP, IRedrawOperation*, ClipDescrP);

So both looks same but still getting the error....any idea why?

 Thanks and Regards,

Arpan