How to change the value of the cell while binding the data to cell in gridpanel.

Hi,<br><br>&nbsp; I have&nbsp;requirement&nbsp;to change the cell data dynamically when ever grid is rendering , i can user "renderer" event but still my logic is based on the text width and height.<br><br>Problem: i have a three columns, one of the column data is&nbsp;exceed the width of the column &nbsp;then add "more" button. when ever user clicks one more button then need to show the whole data. I need a event like "onbeforebind"&nbsp; means before going to append the data to "div". or else please tell me how can i&nbsp;achieve that functionality using events.<br><br>Logic wise i am&nbsp;pretty much clear, but which event i need to capture.... i am not able to getting...<br><br>please specify small example... &nbsp;