Init commit

Infrastructure/Extensions/ObservableCollectionExtensions.cs

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+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+
+namespace StructureHelper
+{
+    public static class ObservableCollectionExtensions
+    {
+        public static void MoveElementToEnd<T>(this ObservableCollection<T> collection, T element)
+        {
+            var elementCopy = element;
+            collection.Remove(element);
+            collection.Add(elementCopy);
+        }
+
+        public static void MoveElementToBegin<T>(this ObservableCollection<T> collection, T element)
+        {
+            var collectionCopy = new List<T>(collection);
+            collectionCopy.Remove(element);
+            collection.Clear();
+            collection.Add(element);
+            foreach (var collectionElem in collectionCopy)
+                collection.Add(collectionElem);
+        }
+
+        public static void MoveElementToSelectedIndex<T>(this ObservableCollection<T> collection, T element, int index)
+        {
+            collection.Remove(element);
+            collection.Insert(index - 1, element);
+        }
+    }
+}