support for .NET framework 3.5

Still have bugs

Net35/HandyControlDemo_Net35/ViewModel/ViewModelLocator.cs

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+using System.Windows;
+using GalaSoft.MvvmLight.Ioc;
+using HandyControlDemo.Service;
+using Microsoft.Practices.ServiceLocation;
+
+namespace HandyControlDemo.ViewModel
+{
+    public class ViewModelLocator
+    {
+        public ViewModelLocator()
+        {
+            ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);
+
+            SimpleIoc.Default.Register<DataService>();
+
+            SimpleIoc.Default.Register<MainViewModel>();
+            SimpleIoc.Default.Register<GrowlDemoViewModel>();
+            SimpleIoc.Default.Register<ImageBrowserDemoViewModel>();
+            SimpleIoc.Default.Register<ComboBoxDemoViewModel>();
+            SimpleIoc.Default.Register<WindowDemoViewModel>();
+            SimpleIoc.Default.Register<ContributorsViewModel>();
+            SimpleIoc.Default.Register<StepBarDemoViewModel>();
+            SimpleIoc.Default.Register<PaginationDemoViewModel>();
+        }
+
+        private static ViewModelLocator _instance;
+
+        public static ViewModelLocator Instance =>
+            _instance ?? (_instance = Application.Current.TryFindResource("Locator") as ViewModelLocator);
+
+        #region Vm
+
+        public MainViewModel Main => ServiceLocator.Current.GetInstance<MainViewModel>();
+
+        public GrowlDemoViewModel GrowlDemo => ServiceLocator.Current.GetInstance<GrowlDemoViewModel>();
+
+        public ImageBrowserDemoViewModel ImageBrowserDemo => ServiceLocator.Current.GetInstance<ImageBrowserDemoViewModel>();
+
+        public ComboBoxDemoViewModel ComboBoxDemo => ServiceLocator.Current.GetInstance<ComboBoxDemoViewModel>();
+
+        public WindowDemoViewModel WindowDemo => ServiceLocator.Current.GetInstance<WindowDemoViewModel>();
+
+        public ContributorsViewModel ContributorsView => ServiceLocator.Current.GetInstance<ContributorsViewModel>();
+
+        public StepBarDemoViewModel StepBarDemo => ServiceLocator.Current.GetInstance<StepBarDemoViewModel>();
+
+        public PaginationDemoViewModel PaginationDemo => ServiceLocator.Current.GetInstance<PaginationDemoViewModel>();
+
+        #endregion
+    }
+}