support for .NET framework 3.5

Still have bugs

Net35/HandyControlDemo_Net35/UserControl/Controls/WindowDemoCtl.xaml.cs

@@ -0,0 +1,51 @@
+using System.Windows;
+using HandyControl.Controls;
+using HandyControl.Tools;
+using MessageBox = HandyControl.Controls.MessageBox;
+
+
+namespace HandyControlDemo.UserControl
+{
+    public partial class WindowDemoCtl
+    {
+        public WindowDemoCtl()
+        {
+            InitializeComponent();
+        }
+
+        private void ButtonMessage_OnClick(object sender, RoutedEventArgs e)
+        {
+            MessageBox.Show(Properties.Langs.Lang.GrowlAsk, Properties.Langs.Lang.Title, MessageBoxButton.YesNo, MessageBoxImage.Question);
+        }
+
+        private void ButtonMouseFollow_OnClick(object sender, RoutedEventArgs e)
+        {
+            var picker = SingleOpenHelper.CreateControl<ColorPicker>();
+            var window = new PopupWindow
+            {
+                PopupElement = picker
+            };
+            picker.SelectedColorChanged += delegate { window.Close(); };
+            picker.Canceled += delegate { window.Close(); };
+            window.Show(ButtonMouseFollow, false);
+        }
+
+        private void ButtonCustomContent_OnClick(object sender, RoutedEventArgs e)
+        {
+            var picker = SingleOpenHelper.CreateControl<ColorPicker>();
+            var window = new PopupWindow
+            {
+                PopupElement = picker,
+                WindowStartupLocation = WindowStartupLocation.CenterScreen,
+                AllowsTransparency = true,
+                WindowStyle = WindowStyle.None,
+                MinWidth = 0,
+                MinHeight = 0,
+                Title = Properties.Langs.Lang.ColorPicker
+            };
+            picker.SelectedColorChanged += delegate { window.Close(); };
+            picker.Canceled += delegate { window.Close(); };
+            window.Show();
+        }
+    }
+}