+1  A: 

As the documentation implies, the Buccon.Command event allows you to specify a "command" so that you can differentiate between which button was clicked, etc.

Bryce Fischer
Can you provide a real world example, please?
user279521
Well, one common example that has been useful to me is a grid where each row has a button (or link) for "Edit" or "Delete". Specify those values for the "Command" and then you know which button was clicked
Bryce Fischer
Adding to Bryce's comment, you would use the command so you can have one method (Some generic event handler) that handles all buttons. (at least this is how i use it) You just use a switch: case; to determine what type of button was clicked and determine what to do from there. You could call another method or just do the work, whatever..
EJC
user279521