how to display substring in UIColumn expands the string on click

How to display a substring in UIColumn of datatable component that expands the string on click. For example, in a datatable column there is only 20 characters space reserved for a particular column. If my data is longer than that, I'd like to show the first 20 characters and allow the user to display/expand the string on click, e.g. "This is a very long varchar that doesn't fit into ...". If the user clicks on "..."

Thanks

[441 byte] By [whitesox12a] at [2007-11-27 11:57:24]