Add Outlook Inspired and Stock Market demos

OutlookInspiredApp/DevExpress.OutlookInspiredApp/Common/ViewModel/SingleObjectChildViewModel.cs

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+using System;
+using DevExpress.Mvvm;
+using DevExpress.Mvvm.DataAnnotations;
+using DevExpress.Mvvm.POCO;
+
+namespace DevExpress.DevAV.Common.ViewModel {
+    public class SingleObjectChildViewModel<TEntity> : ISupportParameter where TEntity : class {
+        public static SingleObjectChildViewModel<TEntity> Create() {
+            return ViewModelSource.Create(() => new SingleObjectChildViewModel<TEntity>());
+        }
+
+        protected SingleObjectChildViewModel() { }
+
+        public virtual TEntity Entity { get; set; }
+        public virtual bool IsEnabled { get; protected set; }
+
+        protected virtual void OnEntityChanged() {
+            IsEnabled = Entity != null;
+        }
+        #region ISupportParameter
+        object ISupportParameter.Parameter {
+            get { return Entity; }
+            set { Entity = (TEntity)value; }
+        }
+        #endregion
+    }
+}