public void RefreshList()
        {
            var windows = API.EnumerateWindows();

            var pinnedWindowList = ((App)Application.Current).pinnedWindowList;

            foreach (var p in pinnedWindowList)
            {
                for (int i = 0; i < windows.Count; i++)
                {
                    var w = windows[i];
                    if (w.Pinned)
                    {
                        continue;
                    }
                    if (w.Handle == p.Handle)
                    {
                        w.Pinned = true;
                    }
                }
            }

            PinWindows.Clear();
            foreach (var w in windows)
            {
                PinWindows.Add(w);
            }
        }
 private void WindowSelectorPage_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
 {
     if ((bool)e.NewValue == false)
     {
         ((App)Application.Current).pinnedWindowList = PinWindows.Where(x => x.Pinned == true).ToList();
     }
 }