Me.WebTab1.ClientEvents.UrlLoaded = "WebTab1_UrlLoaded"
this.WebTab1.ClientEvents.UrlLoaded = "WebTab1_UrlLoaded";
// The client event UrlLoaded takes two parameters sender and e // sender is the object which is raising the event // e is the TabItemEventArgs function WebTab1_UrlLoaded(sender, e) { //Gets index of the tab involved in the event var tabIndex = e.get_tabIndex(); //Assuming you have a label called labelOutput on the form var label = $get('labelOutput'); label.innerHTML = "Url loaded for tab with index '" + tabIndex + "'!"; }