support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Interactivity/EventTrigger.cs

@@ -0,0 +1,29 @@
+using System.Windows;
+
+namespace HandyControl.Interactivity
+{
+    public class EventTrigger : EventTriggerBase<object>
+    {
+        public static readonly DependencyProperty EventNameProperty = DependencyProperty.Register("EventName", typeof(string), typeof(EventTrigger), new FrameworkPropertyMetadata("Loaded", OnEventNameChanged));
+
+        public EventTrigger()
+        {
+        }
+
+        public EventTrigger(string eventName) => EventName = eventName;
+
+        protected override string GetEventName() => EventName;
+
+        private static void OnEventNameChanged(object sender, DependencyPropertyChangedEventArgs args)
+        {
+            ((EventTrigger)sender).OnEventNameChanged((string)args.OldValue, (string)args.NewValue);
+        }
+
+        public string EventName
+        {
+            get => (string)GetValue(EventNameProperty);
+
+            set => SetValue(EventNameProperty, value);
+        }
+    }
+}