Combo Box binding using Mvp architecture.

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.NET

.NET4

hi I am working in a project where the architecture used is MVP,the flow goes like:

If i make a user control(Sample.ascx) under a particular module(Trainee) then the view(ISampleView) and presenter(Sample Presenter) is made automatically,
then I have a business module where the repository(Trainee) is defined,in that i have
TraineeRepository and ITraineeRepository( This interface has the method declaration for the TraineeRepository.),
the flow goes from repo to manager to presenter and then code behind.
now i need to make 2 combo box ,for zipcodes of city and country,
first the user will select the country,and then the city,the moment the user selects the city,the corresponding zip code is displayed on a label..
can anyone help me out...
I know it will sound confusing,please ask me if the same arises.