hello.. can someone help me on my problem with regards to VB...

my problem is that i want to change the value of a cell in a flex grid

for example
if Item no:112 is already in the flex grid and its quantity is 26...and
then the next time the user will input in a text box an itemNo:112 and it's quantity is 10..(all i want to change in the flex grid is it's quantity[instead of 26, it will now be uupdated to 10))..

how to do this?

pls help me... it is my project... deadline is near :(