Dynamically create control in a table cell

Hi,

I have table that on page load populates user name as columns and application name in rows. Against each user and the application, it populates their skill score. Something like below:

                   ABC        XYZ     XXX

MS Excel       2            4          5

MS Access    1            4          5

MS Word      5            3          2

I am able populate the above through the code and each score (2,4, 5...) is a link button added dynamically. What i want is that when user clicks on any of the score, that particular link button clicked by user should be replaced with a drop down list, so that user can select/change values for that table cell. Somthing like this:

                   ABC        XYZ                XXX

MS Excel       2            4                       5

MS Access    1            Dropdwn         5

MS Word      5            3                       2

How can add drop down only to the cell which the user clicked.

any suggestions?

Thanks,