Forms Data Controls :: Update GridView Content With A Stored Procedure?

I'm getting problems to update a database table shown in a gridview using a stored procedure.

My table has 3 columns and my stored procedure is something like:

spUpdateMyTable(@column1 varchar(20), @column2 varchar(50), @id_table integer)

as

update mytable set column1 = @column1, column2 = @column2 where id_table = @id_table

The stored procedure works perfect when I try to execute it in the SQLServer query analizer, but my problem is when I call the sqldatasource update command.

When I do that, it seem that there are problems whith the parameter's names...

I'm doing that whit updateparameters.Add(parameter) and parameter is created whit the same name, tipe and the value that Is shown in the gridView.

I'm looking for in the msdn but everything I founded was about doing that through an update query but I need the stored procedure.