read user selected value in drop down by key.

Hi

I have added drop down by key in table as one of the column. I am getting the entries in the 'drop down by key' but unable to catch the user selected entry. I have to write a method in the 'onselect' event of that UI element.

Please help me on how we can catch the user selected value in the drop down by key?

Thanks in advance...

Regards

Rama