TAB event on Grid

Hi All,
I have taken one grid in that grid i bind four column in grid.
I want how to give TAB event on first column and bind automaticaly link button for details.
Like Purchasing - A/P module in Purchase order page.
In that in grid 'Item No' column give TAB open item no list and with this open Ling button for details of that item no.
Thanks,

Hi
Please see the Purchasing A/P module in that module plz open Purchase order form.
In Purchase order form when i give TAB on Vendor textbox open BP code and after when i select code it shows in that textbox and also shows the link button. When i click on link button opens details of related code.
And also in that form on grid of first column 'item no' give TAB open 'item no' list after selecting item no it shos in that column and link button also. And when i click on link button open details related to item no means another form.
I want do same thing.For that what i do.
I used two textbox txt_cstcode and txt_cstnm. When i give TAB on txt_cstcode open customer code list and also when i select it shows in that textbox. In this i want when i select code that time i want show link button like where used in purchase order form on vendor textbox. And i also want show details on that link button.
And i also bind grid in this i want same as what used in grid of  purchase order form.
Thanks

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