Some.xaml

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:fsxaml="http://github.com/fsprojects/FsXaml"
        Title="MVVM and XAML Type provider"
        Width="400"
        Height="200">
    <Grid>
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>

            <Button HorizontalAlignment="Center"
                    Command="{Binding CreateCommand}"
                    Content="Create" />

            <DataGrid Grid.Row="1"
                      AutoGenerateColumns="False"
                      ItemsSource="{Binding Model}">
                <DataGrid.Columns>
                    <DataGridTextColumn Width="*"
                                        Binding="{Binding .}"
                                        Header="Value" />
                    <DataGridTemplateColumn Width="Auto" Header="+">
                        <DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <Button MinWidth="50"
                                        MaxWidth="50"
                                        Command="{Binding RelativeSource={RelativeSource FindAncestor,
                                                                                         AncestorType={x:Type DataGrid}},
                                                          Path=DataContext.Up}"
                                        CommandParameter="{Binding RelativeSource={RelativeSource Self},
                                                                   Path=DataContext}"
                                        Content="^" />
                            </DataTemplate>
                        </DataGridTemplateColumn.CellTemplate>
                    </DataGridTemplateColumn>
                </DataGrid.Columns>
            </DataGrid>
        </Grid>
    </Grid>
</Window>