Ajax autocomplete extender getting more values based on selection

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ASP.NET

Ajax

Hello programmers, got a minor problem here. As you see I have 3 textboxes in which 1 has an element of AutoCompleteExtender. My question is when I choose a data from textbox w/ completeextender I want the extension of the data bassed on my db will be automatically post on the remaining textbox
let say like this one:

ON MY DATABASE
column 1               column 2          column 3
red                    red1               red2
blue                   blue1              blue2
green                  green1             green2
...

so if the column 1 is the element of the autocomplete extender that is nested on textbox 1 (If I choose red)
and 1 choose the data red
the column 2 will be automatically posted at textbox 2(red1)
the column 3 will be automatically posted at textbox 3(red2)

Any help/tutorials is gladly aprreciated..
Thanks in advance