[vtkusers] help=( call back command

[A J]

Hi, why do I get the following compile error?? I have the correct parameters 
in the function taken in by SetCallback..? So why doenst it seem to 
recognize it??

no matching function for call to `vtkCallbackCommand::   
SetCallback(<unknown type>)'
/usr/local/include/vtk/vtkCallbackCommand.h:65: candidates are:
void vtkCallbackCommand::SetCallback(void (*)(vtkObject*, long unsigned int, 
void*, void*))

I have a class, say MyClass, and I have the following:

void MyClass::function()
{
        Iren->AddObserver( vtkCommand::EnterEvent , CallbackCommand );
	CallbackCommand->SetCallback(DoStuff);
}

void MyClass::DoStuff( vtkObject* caller, long unsigned int a, void* arg, 
void* b)
{
    cout<<"detected event"<<endl;
}


void MyClass::Anotherfunction()
{
   while(1) Iren->Render();
}

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