Does IObserver required while I have my own observer interfaceID / implementation?

Question

Hi All
I have created a class for a button as below and not used IID_IOBSERVER. It didn't work for me. But the same thing works with sdk sample 'snippetrunner' for 'GoButton'. Do I need to define my own Interface while I use my own IID?
    Class
        kMSRDoButtonBoss,
        kRollOverIconButtonBoss,
               IID_IMSRDOBUTTONOBSERVER,    kMSRDoButtonObserverImpl,
---- MSRDoButtonObserver.cpp ---
class MSRDoButtonObserver : public CObserver
    public:
        MSRDoButtonObserver( IPMUnknown* boss );
        virtual ~MSRDoButtonObserver();
        virtual void AutoAttach();
        virtual void AutoDetach();
        virtual void Update( const ClassID& theChange, ISubject* theSubject, const PMIID& protocol, void* changedBy ) ;
    private:
        const PMIID fObserverIID;
CREATE_PMINTERFACE(MSRDoButtonObserver, kMSRDoButtonObserverImpl)
MSRDoButtonObserver::MSRDoButtonObserver( IPMUnknown* boss ) :
CObserver( boss ), fObserverIID(IID_IMSRDOBUTTONOBSERVER)
MSRDoButtonObserver::~MSRDoButtonObserver(){}
void MSRDoButtonObserver::AutoAttach()
    do {
        InterfacePtr<ISubject> subject(this, UseDefaultIID());
        ASSERT(subject);
        if (!subject) {
            break;
        subject->AttachObserver(this, ITriStateControlData::kDefaultIID, fObserverIID);
    } while(false);
void MSRDoButtonObserver::AutoDetach()
    do {
        InterfacePtr<ISubject> subject(this, UseDefaultIID());
        ASSERT(subject);
        if (!subject) {
            break;
        subject->DetachObserver(this, ITriStateControlData::kDefaultIID, fObserverIID);
    } while(false);
void MSRDoButtonObserver::Update(const ClassID& theChange, ISubject* theSubject, const PMIID& protocol, void* changedBy )
    //if(theChange == kTrueStateMessage)
        CAlert::InformationAlert("Hi");
thanks
Hakkim.Ays

Answer 1

Hi Dirk
Thanks for ur reply.
Yes I have added 'kMSRDoButtonBoss' in class def & type of .fr file.
type MSRDoButton    (kViewRsrcType) : RollOverIconButtonWidget (ClassID = kMSRDoButtonBoss)
And panel edit mode, shows classId as 'kMSRDoButtonBoss'.
When I click the button nothing happens!?
Hakkim.Ays