WebProgressBar.ClientEvents.DoubleClick = "WebProgressBar_DoubleClick"WebProgressBar.ClientEvents.DoubleClick = "WebProgressBar_DoubleClick";// The client event 'DoubleClick' takes two parameters sender and e // sender is the object which is raising the event // e is the EventArgs function WebProgressBar_DoubleClick(sender, e) { alert("WebProgressBar doubleclicked!"); }