Me.WebTab1.ClientEvents.TabAddAnimationEnded = "WebTab1_TabAddAnimationEnded"
this.WebTab1.ClientEvents.TabAddAnimationEnded = "WebTab1_TabAddAnimationEnded";
// The client event TabAddAnimationEnded takes two parameters sender and e // sender is the object which is raising the event // e is the TabItemEventArgs function WebTab1_TabAddAnimationEnded(sender, e) { //Gets the index where a new tab is added var tabIndex = e.get_tabIndex(); //Assuming you have a label called labelOutput on the form var label = $get('labelOutput'); label.innerHTML = "Tab add animation ended at index '" + tabIndex + "'..."; }