WebDataMenu1.ClientEvents.ItemExpanding = "WebDataMenu1_ItemExpanding"
WebDataMenu1.ClientEvents.ItemExpanding = "WebDataMenu1_ItemExpanding";
// The client event 'ItemExpanding' takes two parameters sender and e // sender is the object which is raising the event // e is the DataMenuItemCancelEventArgs function WebDataMenu1_ItemExpanding(sender, e) { //Gets the DataMenuItem object that is expanding var Item = e.getItem(); //Gets the text of the expanding item var ItemText = Item.get_text(); if (!confirm("Are you sure you want show child items under the item '"+ItemText+"'?")) //Cancels the ItemExpanding event e.set_cancel(true); }