Modeling M-V-VM

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.ObjectModel;
using System.Windows.Input;

using WorldDataLib.Model;

namespace TestTreeViewWithRightBarView.ViewModel
{
    /// <summary>
    /// This class represesnts the head of the tree
    /// </summary>
    public class TreeRootViewModel : ITreeViewWithChildrenNode
    {
        #region Members

        IViewModel m_Parent;
        ObservableCollection<ITreeViewNode> m_Children;

        #endregion

        #region Properties

        #region ITreeViewWithChildrenNode Members

        public ObservableCollection<ITreeViewNode> Children
        {
            get 
            { 
                return m_Children; 
            }
        }

        #endregion

        #region ITreeViewNode Members

        public string Caption
        {
            get 
            {
                return "Planet Earth"; 
            }
        }

        #endregion

        #region IViewModel Members

        public IViewModel VMParent
        {
            get
            {
                return m_Parent; 
            }
        }

        #endregion        

        #endregion

        #region Methods

        #region Ctor

        public TreeRootViewModel(IViewModel parent, List<Continent> continents)
        {
            m_Parent = parent;
            m_Children = new ObservableCollection<ITreeViewNode>();
            if (continents != null)
            {
                for (int iter = 0; iter < continents.Count; iter++)
                {
                    m_Children.Add(new ContinentViewModel(this, continents[iter]));
                }
            }
        }        

        #endregion  

        #region IViewModel Members

        /// <summary>
        /// When the event is 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="param"></param>
        /// <param name="viewModelEvent"></param>
        public void HandleEvent(IViewModel sender, object param, ViewModelOperationsEnum viewModelEvent)
        {
            if (m_Parent != null)
            {
                m_Parent.HandleEvent(sender, param, viewModelEvent);
            }
        }

        #endregion

        #region GotFocus

        public ICommand GotFocus
        {
            get
            {
                return new DelegateCommand(this.ControlGotFocus);
            }
        }

        /// <summary>
        /// When the control gets focus, an event is fired for external handling
        /// </summary>
        public void ControlGotFocus()
        {
            if (VMParent != null)
            {
                VMParent.HandleEvent(this, null, ViewModelOperationsEnum.GotFocus);
            }
        }

        #endregion

        #endregion
    }
}