1  public class MyTabControl : TabControl 2     { 3  4         Timer t = null; 5         protected override void OnSelectionChanged(SelectionChangedEventArgs e) 6         { 7             Action a = () => 8             { 9                 try10                 {11                     var control = e.Source as MyTabControl;12                     if (control == null) return;13                     base.OnSelectionChanged(e);14                     left = 80;15                     var selectItem = control.SelectedContent as Grid;16                                 17                     selectItem.Visibility = Visibility.Collapsed;18 19                     t = new Timer(Move, selectItem, 0, 2);20                 }21                 catch (Exception)22                 {23 24                     MainPanelWindow.TimerManager(true);25                 }26             };27             this.Dispatcher.BeginInvoke(a);28         }29 30         private int left = 80;31         public void Move(object o)32         {33 34             Action a = () =>35             {36                 try37                 {38                     left -= 6;39                     if (left <= 0)40                     {41                         t.Dispose();42                43                         return;44                     }45 46 47                     var selectItem = o as Grid;48                     if (selectItem == null) return;49                 50                     selectItem.Visibility = Visibility.Visible;51                     selectItem.Margin = new Thickness(left, 0, 0, 0);52                 }53                 catch (Exception)54                 {55 56                 }57             };58             this.Dispatcher.BeginInvoke(a);59         }60 61  }