Presentation Model (MVVM) Good Practices

using System;
using System.Collections.Generic;
using System.Text;
using PresentationModelBase;
using System.Threading;
using System.ComponentModel;

namespace App.Core
{
    public class EntityCollectionViewPresentationModel<T> : SelectableViewPresentationModel, IEntityCollectionViewPresentationModel<T>
        where T : class, new()
    {
        public EntityCollectionViewPresentationModel()
        {
            _mainView = Get<IMainViewPresentationModel>(); //getting a reference to the main window.
            _entityDao = Get<IDao<T>>();
            _entityCollection = Get<ICollection<IEntityViewPresentationModel<T>>>();
            _entityDao.Changed += _entityDao_Changed;
        }

        void _entityDao_Changed(object sender, ListChangedEventArgs e)
        {
            T item = (T)sender;
            switch (e.ListChangedType)
            {
                case ListChangedType.ItemAdded:
                    var newView = Get<IEntityViewPresentationModel<T>>();
                    newView.Entity = item;
                    _entityCollection.Add(newView);
                    break;
                case ListChangedType.ItemChanged:
                    var view = Find(item);
                    view.Entity = null;
                    view.Entity = item;
                    break;
            }
        }

        IEntityViewPresentationModel<T> Find(T entity)
        {
            foreach (var item in _entityCollection)
            {
                if (entity == item.Entity)
                    return item;
            }
            return null;
        }

        IMainViewPresentationModel _mainView;
        IDao<T> _entityDao;

        public void LoadData()
        {
            Thread.Sleep(3000);
            _entityCollection.Clear();
            foreach (T item in _entityDao.SelectAll())
            {
                var entityView = Get<IEntityViewPresentationModel<T>>();
                entityView.Entity = item;
                _entityCollection.Add(entityView);
            }
        }

        #region IEntityCollectionViewPresentationModel<T> Members

        private ICollection<IEntityViewPresentationModel<T>> _entityCollection;
        public ICollection<IEntityViewPresentationModel<T>> EntityCollection
        {
            get { return _entityCollection; }
        }

        private IEntityViewPresentationModel<T> _selected;
        public virtual IEntityViewPresentationModel<T> Selected
        {
            get { return _selected; }
            set
            {
                if (_selected == value)
                    return;
                _selected = value;
                OnPropertyChanged("Selected");
                OnPropertyChanged("CanRemove");
            }
        }    

        public void CreateNew()
        {
            _mainView.CreateNew<T>();
        }

        public void RemoveSelected()
        {
            if (AskQuestion("Are you sure you remove this item?") == QuestionResult.Yes)
            {
                _entityDao.Remove(_selected.Entity);
                _entityCollection.Remove(_selected);
            }
        }

        public bool CanRemove
        {
            get { return Selected != null; }
        }

        #endregion
    }
}