onListItemDblClick

fires when an item has been double-clicked

void onListItemDblClick(string itemId,Event ev,HTMLElement node,object list);

itemId	string	the id of the clicked item
ev	Event	a native event object
node	HTMLElement	the target HTML element
list	object	the list object where double-click has happened

$$("myBoard").attachEvent("onListItemDblClick", function(itemId,ev,node,list){
    // your code
});