I have an ASP.NET Web Forms project i am working with and need some help with my grid.

I have a pretty basic grid on my page. i am able to populate it mostly.

i use codebehind to bind a list to it from c#.

I need to figure out how to perform this,

I have the proper data in my list to be bound to the grid. i want to have my rows show some important data to my customer, but when he expands the row the data in the expansion is more data from the same list, for that row.

so when a user is browsing the grid, they can click on any row and it does its thing, but if they click the expander icon they get a bit more data about the row.

I hope i explained this well, im about to break out mspaint and draw it up...