Data binding to SelectedItem in a WPF Treeview

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How can I retrieve the item that is selected in a WPF-treeview? I want to do this in XAML, because I want to bind it.

You might think that it is SelectedItem but apparently that does not exist is readonly and therefore unusable.

This is what I want to do:

<TreeView ItemsSource="{Binding Path=Model.Clusters}" 
            ItemTemplate="{StaticResource ClusterTemplate}"
            SelectedItem="{Binding Path=Model.SelectedCluster}" />

I want to bind the SelectedItem to a property on my Model.

But this gives me the error:

‘SelectedItem’ property is read-only and cannot be set from markup.

Edit:
Ok, this is the way that I solved this:

<TreeView
          ItemsSource="{Binding Path=Model.Clusters}" 
          ItemTemplate="{StaticResource HoofdCLusterTemplate}"
          SelectedItemChanged="TreeView_OnSelectedItemChanged" />

and in the codebehindfile of my xaml:

private void TreeView_OnSelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
    Model.SelectedCluster = (Cluster)e.NewValue;
}

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