This event calls user-defined handlers (if there are any) and passes the following parameter:

• itemId - id of the item.

    dhxAccord.attachEvent("onUnDock", function(itemId){
        // code here
    });    
    // or
    function doOnUnDock(itemId){
        // code here
    });    
    dhxAccord.attachEvent("onUnDock", doOnUnDock);