Creating an Animated ContentControl

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Windows.Input;
using GalaSoft.MvvmLight.Command;

namespace AnimatedContentControlSample.ViewModels
{
	/// <summary>
	/// Viewmodel for the main window
	/// </summary>
	class MainWindowViewModel : ViewModelBase
	{
		private object m_content;
		private int m_contentCount;

		/// <summary>
		/// Gets the content that is to be displayed in the view
		/// </summary>
		public object Content
		{
			get { return m_content; }
			set
			{
				if (m_content != value)
				{
					m_content = value;
					RaisePropertyChanged("Content");
				}
			}
		}
		
		public ICommand ChangeContentCommand
		{
			get
			{
				return new RelayCommand(() => Content = new MyContentViewModel(++m_contentCount));
			}
		}
	}
}