onAfterStatusChange

fires after an item has been dropped into the list with a different status

void onAfterStatusChange(string itemId,string status,object list);

itemId	string	the item id
status	string	a new item status
list	object	the list object where the event has happened

$$("myBoard").attachEvent("onAfterStatusChange", function(itemId,status,list){
    // your code
});