WebDataMenu1.ClientEvents.ItemCollapsing = "WebDataMenu1_ItemCollapsing"
WebDataMenu1.ClientEvents.ItemCollapsing = "WebDataMenu1_ItemCollapsing";
// The client event 'ItemCollapsing' takes two parameters sender and e // sender is the object which is raising the event // e is the DataMenuItemCancelEventArgs function WebDataMenu1_ItemCollapsing(sender, e) { //Gets the DataMenuItem object that is collapsing var Item = e.getItem(); //Gets the text of the collapsing item var ItemText = Item.get_text(); if (!confirm("Are you sure you want hide child items under the item '"+ItemText+"'?")) //Cancels the ItemCollapsing event e.set_cancel(true); }