Developing a MultiSelector

using System.Collections.ObjectModel;
using System.Linq;

namespace SelectionAreaSample
{
    public sealed class DataItem : Observable
    {
        #region Constructors

        public DataItem()
        {
            Items = new ObservableCollection<DataItem>();
            PanelType = 1;
            LassoType = 1;
            SelectionType = 1;
        }

        #endregion Constructors

        #region Public Properties

        public ObservableCollection<DataItem> Items { get; private set; }

        public int Type { get; set; }

        public int PanelType
        {
            get
            {
                return panelType;
            }
            set
            {
                base.RaisePropertyChanged(() => PanelType, ref panelType, value);
            }
        }

        public int LassoType
        {
            get
            {
                return lassoType;
            }
            set
            {
                base.RaisePropertyChanged(() => LassoType, ref lassoType, value);
                Items.ToList().ForEach(a => a.LassoType = value);
            }
        }

        public int SelectionType
        {
            get
            {
                return selectionType;
            }
            set
            {
                base.RaisePropertyChanged(() => SelectionType, ref selectionType, value);
                Items.ToList().ForEach(a => a.SelectionType = value);
            }
        }

        public bool IsSelected
        {
            get
            {
                return isSelected;
            }
            set
            {
                base.RaisePropertyChanged(() => IsSelected, ref isSelected, value);
            }
        }

        public bool Scoped
        {
            get
            {
                return scoped;
            }
            set
            {
                base.RaisePropertyChanged(() => Scoped, ref scoped, value);
                Items.ToList().ForEach(a => { a.Scoped = value; a.IsSelected = false; });
            }
        }

        public double Left { get; set; }
        public double Top { get; set; }
        public double Width { get; set; }
        public double Height { get; set; }

        #endregion Public Properties

        #region Private Fields

        private int panelType;
        private int lassoType;
        private int selectionType;
        private bool isSelected;
        private bool scoped;

        #endregion Private Fields
    }
}