MVVM radiobuttons

Jaime Rodriguez, who works at Microsoft on WPF, publishes an unabridged Q&A on WPF, and the latest issue has a post on RadioButtons and MVVM !

The post is at http://blogs.msdn.com/jaimer/archive/2009/09/22/wpf-discussion-090922.aspx, and you want to look at the last item in that post. I tested the solution and it works to my satisfaction.

Quoted for convenience:

I've worked around this issue in .NET 3.5 SP1. Here's how I data bind a group of radio buttons to an enum-valued property:

<StackPanel>
    <RadioButton Content="New folder"
        IsChecked="{Binding Path=PublishTarget,
                    Converter={StaticResource equalityConverter},
                    ConverterParameter={x:Static local:PublishTarget.NewServerFolder}, Mode=TwoWay}"
        GroupName="1" />

    <RadioButton Content="Existing folder"
        IsChecked="{Binding Path=PublishTarget,
                    Converter={StaticResource equalityConverter},
                    ConverterParameter={x:Static local:PublishTarget.ExistingServerFolder},
                    Mode=TwoWay}"
        GroupName="2" />

    <RadioButton Content="Local folder"
        IsChecked="{Binding Path=PublishTarget,
                    Converter={StaticResource equalityConverter},
                    ConverterParameter={x:Static local:PublishTarget.LocalFolder},
                    Mode=TwoWay}"
        GroupName="3" />
</StackPanel>

Setting each radio button's GroupName to a unique value prevents the bindings from getting clobbered when the user clicks on a radio button. Here I'm relying on the data source to implement INotifyPropertyChanged, which will tell the other radio buttons to update. A similar approach should work for radio buttons in an ItemsControl.

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.