Creating dynamic rows based on list retrieved from server

Creating dynamic rows based on list retrieved from server

So the application flow is, user clicks on add button, it opens a pop-up
window ().
On this window, I need to load list of countries that I am fetching on
onLoad event of this form and based on the list I need to add checkbox and
country name in table.
I am already fetching the country list from server but how do I create
rows/columns dynamically based on the country list? I am using DWR.