The reason this is working for you so far is that your filter always gives enough records to fill the grid. Try a filter that only shows the last physical record. It should be very slow.

>A textbox allows users to perform search (using a index of course), and by typing letters the grid display the last line found or select automatically the last letter to allow user to type another one which match or to select the record needed in the grid.
>
>In some of case about 10 000 records should be display in the grid.
>
>Roman