Query Customer BO using a custom field

Hi,

I've created an extension for the standard business object 'Customer' and I've added two new elements, one under node 'AddressInformation' and the other under node 'Common'.

I want to Query this Customer BO using these custom fields (in the script, I want to get Customers with specific values in these fields), but I can only see these Queries that do not contain my custom fields.

Customer.QueryByBusinessObjectCustomer

Customer.QueryByCommunicationData

Customer.QueryByIdentification

How can I achieve this?

Thanks,

Alejandro Cordero.