RhinoMocks: how to test if method was called when using PartialMock

Question

I have a clas that is something like this

public class MyClass
{
  public virtual string MethodA(Command cmd)
  { //some code here}
  public void MethodB(SomeType obj)
  { 
     // do some work
     MethodA(command);
   }

}

I mocked MyClass as PartialMock (mocks.PartialMock<MyClass>) and I setup expectation for MethodA

var cmd = new Command(); 
//set the cmd to expected state
Expect.Call(MyClass.MethodA(cmd)).Repeat.Once();

Problem is that MethodB calls actual implementation of MethodA instead of mocking it up. I must be doing something wrong (not very experienced with RhinoMocks). How do I force it to mock MetdhodA?

Here is the actual code:

  var cmd = new SetBaseProductCoInsuranceCommand();
            cmd.BaseProduct = planBaseProduct;
            var insuredType = mocks.DynamicMock<InsuredType>();
            Expect.Call(insuredType.Code).Return(InsuredTypeCode.AllInsureds);
            cmd.Values.Add(new SetBaseProductCoInsuranceCommand.CoInsuranceValues()
                               {
                                   CoInsurancePercent = 0,
                                   InsuredType = insuredType,
                                   PolicySupplierType = ppProvider
                               });

            Expect.Call(() => service.SetCoInsurancePercentages(cmd)).Repeat.Once();

            mocks.ReplayAll();

            //act
            service.DefaultCoInsurancesFor(planBaseProduct);

            //assert
            service.AssertWasCalled(x => x.SetCoInsurancePercentages(cmd),x=>x.Repeat.Once());