Calling 'Parent' functions

When creating a new class inherited from RigidShape, I write the following for its onAdd method:

bool Pickup::onAdd()
{
   if (!Parent::onAdd())
      return false;

   return true;
}

On building, I get this error:

Quote:error C2352: 'RigidShape::onAdd' : illegal call of non-static member function

And it tells me to see the declaration of RigidShape::onAdd.
I've defined typedef RigidShape Parent in pickup.h, I've done everything the same way as RigidShap does to make its parent calls to ShapeBase. Is there something I'm missing?