data binding - MVVM radiobuttons

Question

Someone please help. I have an interesting issue. I am trying to implement an MVVM app and I want to bind to radiobuttons in my view.

Here's my view:

<StackPanel Orientation="Horizontal" Grid.ColumnSpan="2"  >
    <RadioButton GroupName="1" IsChecked="{Binding Path=NoteGeneral, Mode=TwoWay}">General</RadioButton>
    <RadioButton GroupName="1" IsChecked="{Binding Path=NoteContact, Mode=TwoWay}" >Contact</RadioButton>
    <RadioButton GroupName="1" IsChecked="{Binding Path=NoteAddress, Mode=TwoWay}" >Address</RadioButton>
    <RadioButton GroupName="1" IsChecked="{Binding Path=NotePhone, Mode=TwoWay}" >Phone</RadioButton>
</StackPanel>

Here's my ViewModel:

    bool _NoteGeneral;
    public bool NoteGeneral
    {
        get { return _NoteGeneral; }
        set
        {
            _NoteGeneral = value;
            OnPropertyChanged("NoteGeneral");
        }
    }

    bool _NoteContact;
    public bool NoteContact
    {
        get { return _NoteContact; }
        set
        {
            _NoteContact = value;
            OnPropertyChanged("NoteContact");
        }
    }

    bool _NoteAddress;
    public bool NoteAddress
    {
        get { return _NoteAddress; }
        set
        {
            _NoteAddress = value;
            OnPropertyChanged("NoteAddress");
        }
    }

    bool _NotePhone;
    public bool NotePhone
    {
        get { return _NotePhone; }
        set
        {
            _NotePhone = value;
            OnPropertyChanged("NotePhone");
        }
    }

The problem is this, when I click the different radiobuttons the property setter only gets called the first time(when i run thru debugging). e.g. When I click NoteGeneral, NoteContact, then NoteGeneral again only the first two clicks update my viewmodel. I think I might have something wrong with my binding, or maybe I'm approaching this the completely wrong way.

Can anyone help?

How should I implement radiobutton selections in my viewmodel?

.NET 4 and Later

This issue with RadioButton binding was resolved by Microsoft when .NET 4 was released. Binding of RadioButtons now works as you would expect without any of the work-arounds listed below.

Answer 1

Take a look here.

I haven't implemented the solution provided but it makes sense. The underlying framework control breaks you bindings when a click is performed. The solution is to override the method that does this and just rely on the bindings.