Adding Records To SQL CE With Standard VS2008 Without Getting Identity Value

I'm using VS2008 (as shipped with SQL CE 3.5 as shipped).
I want to write a database app and started with a quite simple example:
One table "Master" has 2 columns: int MasterID, int Value (where the MasterID is the primary key and is an identity column.

For the GUI I used the typed dataset components (based on the namespace: System.Data.SqlServerCe) which were automatically generated by VS2008. I just dropped the table from the datasources view to a form and got a DataGridview, a Navigator and some DB components, quite fine so far.

When i run the app i can add new rows and the identity column is filled with -1, -2 ... as expected. When I hit the save button, the rows are saved to DB, but the values of the identity columns are not updated (the still have -1, -2..)

When I use the exact same example with SQL Express evrything works fine: the identity Column's values are updated automatically and have +1, +2, ...
Sure there is a statement "SELECT @@IDENTITY"... but I'm just using automated code so far, and i expect that code to work (automatically). Next problem: if i want to insert that "Select @@identity" stuff (I don't want to do that, but perhaps I have to?) where can I do this, I did not found a OnInsertedRow-Event?
This problem is part of a bigger one: I want to use Master/Detail, but inserting the Details fails because the inserting of the master rows didn't return the correct Indentity values, so the detail rows cannot be inserted (the foreign keys -1, -2... will raise an error).

thanks in advance, Bernd.