public void AddScreen()
        {
            var newScreen = new MyScreenViewModel {
                DisplayName = string.Concat("Tab ", Items.Count + 1)
            };

            Items.Add(newScreen);
        }
        public void AddScreen()
        {
            var result    = openFolderDialog.DetermineFile();
            var newScreen = new MyScreenViewModel {
                DisplayName = string.Concat("Tab ", Items.Count + 1)
            };

            Items.Add(newScreen);
        }