How to delete selected row when user click on delete button

Question

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