User Control Problem

i create a user control and use the dataform wizard to create the form and bind that control. if i navigate through the dataset with the navigate buttons created by the wizard and press the update button, it will try to update all the rows i have seen no matter if i edited or not. when using the windows textbox control it only updates the one that are edited. i could not find a solution to this. so after a while of updating it will return an error. Is this a known issue?