Typed Dataset and Change Event

I have a typed dataset with a master table and several detail tables. The details are displayed with DataGridView's. If a value of a field of the detail tables has changes, the time should be noted in the corresponding record of the master table.
How can I catch the row change event of the detail tables and set a new value in the master record (without touching the generated code of the dataset)?

Thanks in advance for the help.
Peter

[449 byte] By [panpan] at [2007-12-16]