feature<WorkingCopy>: add grid layout for unstaged and staged files mode

src/UI/FilesDisplayModeSwitch.xaml.cs

@@ -0,0 +1,46 @@
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+
+namespace SourceGit.UI {
+
+    /// <summary>
+    ///     Interaction logic for FilesDisplayModeSwitch.xaml
+    /// </summary>
+    public partial class FilesDisplayModeSwitch : UserControl {
+
+        public static readonly DependencyProperty ModeProperty =
+            DependencyProperty.Register(
+                "Mode", 
+                typeof(Git.Preference.FilesDisplayMode), 
+                typeof(FilesDisplayModeSwitch), 
+                new PropertyMetadata(Git.Preference.FilesDisplayMode.Grid));
+
+        public Git.Preference.FilesDisplayMode Mode {
+            get { return (Git.Preference.FilesDisplayMode)GetValue(ModeProperty); }
+            set { SetValue(ModeProperty, value); }
+        }
+
+        public FilesDisplayModeSwitch() {
+            InitializeComponent();
+        }
+
+        private void OpenModeSelector(object sender, RoutedEventArgs e) {
+            selector.PlacementTarget = sender as Button;
+            selector.IsOpen = true;
+            e.Handled = true;
+        }
+
+        private void UseGrid(object sender, RoutedEventArgs e) {
+            Mode = Git.Preference.FilesDisplayMode.Grid;
+        }
+
+        private void UseList(object sender, RoutedEventArgs e) {
+            Mode = Git.Preference.FilesDisplayMode.List;
+        }
+
+        private void UseTree(object sender, RoutedEventArgs e) {
+            Mode = Git.Preference.FilesDisplayMode.Tree;
+        }
+    }
+}