i've created grid class and put that codes and properties on it :) that's way it doesnt run.
is that codes and properties for textbox ?

I see that in a different thread, Barbara Peisch said:

If you would like to use a textbox for doing an incremental seek instead of the incremental seek built into the listbox, I have an incremental seek class on my web site (www.peisch.com/downloads) that's meant to work with a grid. That should give you some ideas of how to make this work with a listbox. Besides changing all the references from a grid to a listbox, you'll also have to change the listindex property of the listbox.

Since she has code posted that may do what you are trying to do, why don't you download her samples < s > ?