DLookup in Continuous form

[stalo]

I have a subform which is in continuous form based on table. I created a new textbox to be appeared in each row. In this textbox I want to be displayed an additional information derived from a query. So in the Control source of this textbox i used the Dlookup function. It works fine for the first record of the contiuous form. It doesn't display anything on the rest of the rows. Can anyone please help me on that? Thanks.