Hi Pranav

Here is a sample eSpace with that.

Here is also a screenshot:


On my sample it also allows to unselect checked combo boxes.
If you want to forbid that, then change the javascripts to something like:

"if(!this.checked) { this.checked = true; }
document.getElementById(""" + Combo2.Id + """).checked = false;"

and

"if(!this.checked) { this.checked = true; }
document.getElementById(""" + Combo1.Id + """).checked = false;"

Regards
João Rosado