support for .NET framework 3.5

Still have bugs

Net35/HandyControlDemo_Net35/ViewModel/GrowlDemoViewModel.cs

@@ -0,0 +1,62 @@
+using GalaSoft.MvvmLight.Command;
+using HandyControl.Controls;
+using HandyControl.Data;
+
+namespace HandyControlDemo.ViewModel
+{
+    public class GrowlDemoViewModel
+    {
+        private RelayCommand _infoCmd;
+
+        public RelayCommand InfoCmd =>
+            _infoCmd ?? (_infoCmd = new RelayCommand(() => Growl.Info(Properties.Langs.Lang.GrowlInfo)));
+
+        private RelayCommand _successCmd;
+
+        public RelayCommand SuccessCmd =>
+            _successCmd ?? (_successCmd = new RelayCommand(() => Growl.Success(Properties.Langs.Lang.GrowlSuccess)));
+
+        private RelayCommand _warningCmd;
+
+        public RelayCommand WarningCmd =>
+            _warningCmd ?? (_warningCmd = new RelayCommand(() =>
+                Growl.Warning(new GrowlInfo
+                {
+                    Message = Properties.Langs.Lang.GrowlWarning,
+                    CancelStr = Properties.Langs.Lang.Ignore,
+                    ActionBeforeClose = isConfirmed =>
+                    {
+                        Growl.Info(isConfirmed.ToString());
+                        return true;
+                    }
+                })));
+
+        private RelayCommand _errorCmd;
+
+        public RelayCommand ErrorCmd =>
+            _errorCmd ?? (_errorCmd = new RelayCommand(() => Growl.Error(Properties.Langs.Lang.GrowlError)));
+
+        private RelayCommand _askCmd;
+
+        public RelayCommand AskCmd =>
+            _askCmd ?? (_askCmd = new RelayCommand(() =>
+                Growl.Ask(Properties.Langs.Lang.GrowlAsk, isConfirmed =>
+                {
+                    Growl.Info(isConfirmed.ToString());
+                    return true;
+                })));
+
+        private RelayCommand _fatalCmd;
+
+        public RelayCommand FatalCmd =>
+            _fatalCmd ?? (_fatalCmd = new RelayCommand(() => Growl.Fatal(new GrowlInfo
+            {
+                Message = Properties.Langs.Lang.GrowlFatal,
+                ShowDateTime = false
+            })));
+
+        private RelayCommand _clearCmd;
+
+        public RelayCommand ClearCmd => _clearCmd ?? (_clearCmd = new RelayCommand(Growl.Clear));
+    }
+}