KeyDown プロパティ (TabClientEvents)

// The client event KeyDown takes two parameters sender and e
// sender  is the object which is raising the event
// e is the TabItemCancelEventArgs

function WebTab1_KeyDown(sender, e) {

     //Gets the index of the tab raising the event
    var tabIndex = e.get_tabIndex();
    
    if (tabIndex == 1)

    //Cancels the KeyDown event if tab index is 1
     e.set_cancel(true);

}