How to how show and hide rows in datagrid?

Question

Hi, i need help... i have a windows application, in which there a datagrid, and i have to show details in the grid in such a way, that when i click "Show Details"(which i can get as a row in the datagrid), the grid expands showingme more rows which get inserted where i clicked on show details... Similarly, when i click 'Hide Details", the rows are not shown... Does any one has code for this funnctionality of datagrid? plz do help me... thanx, Deepa