MVVM - implementing 'IsDirty' functionality to a ModelView in order to save data

Question

Being new to WPF & MVVM I struggling with some basic functionality.

Let me first explain what I am after, and then attach some example code...

I have a scree

Answer 1

I've done some work on implementing IsDirty for models that is wrapped in my ViewModel.

The result really simplified my ViewModels:

public class PersonViewModel : ViewModelBase
{
    private readonly ModelDataStore<Person> data;
    public PersonViewModel()
    {
        data = new ModelDataStore<Person>(new Person());
    }

    public PersonViewModel(Person person)
    {
        data = new ModelDataStore<Person>(person);
    }

    #region Properties

    #region Name
    public string Name
    {
        get { return data.Model.Name; }
        set { data.SetPropertyAndRaisePropertyChanged("Name", value, this); }
    }
    #endregion

    #region Age
    public int Age
    {
        get { return data.Model.Age; }
        set { data.SetPropertyAndRaisePropertyChanged("Age", value, this); }
    }
    #endregion

    #endregion
}

Code @ http://wpfcontrols.codeplex.com/ Check under the Patterns assembly and MVVM folder, you'll find a ModelDataStore class.

P.S. I haven't done a full scale test on it, just the really simple test you'll find the Test assembly.