Formview Detailview null values and insert edit with foreign keys

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Is it possibly to have the formview and or detail view be dynamic? I mean if
there is a dropdownlist with a list of names from one table that will display
details from an other table in a formview or detailsview that is related by
foreign key but not all the fields are needed all the time. Can the fields
be dynamicly created based on what fields have vaules for the givin foreign
key selected in the dropdownlist? I know you can set it up at design time
but how about runtime? This is a general question that I ned to use on a
greater problem.

Thank you,
Haak