How to delete selected row when user click on delete button

i am working with ingragestic Grid " UltraWebGrid "

I have placed asp.button in grid for delete ( UltraWebGrid )

kindly tell me how to delete selected record

i mean to say as

we can do same thing using " asp.net grid view " by using " RowDeleting " event

How can we mange like this by using " UltraWebGrid "

how can we get key field like in " asp.grid view " we use " DataKeyNames " at bind time .Later we get it by using " gv.DataKeys[e.RowIndex].Value "

how we do this in UltraWebGrid of Infragestic

Is there any sample or article e.t.c