How to add the grid inside a grid in asp.net with Ajax?

We are going to create a report web form for a trading company where we require a grid inside a grid. Let us say if some user wants to see the number of trades in one grid and the details of the specific trade inside the another grid.
It will be like when user clicks on the row of the grid a child grid should opened displaying all the necessary details of the trade. All this needs to be implemented in asp.net with ajax. I am curious to know how we can implement this scenarios?
Thanks in advance.
