<ToolBar Grid.Row="1">
            <ToolBar.ItemsSource>
                <CompositeCollection>
                    <CollectionContainer Collection="{Binding Path=Items, Source={StaticResource ResourceKey=MyContextMenu}}"/>
                </CompositeCollection>
            </ToolBar.ItemsSource>
            <ToolBar.ItemTemplate>
                <DataTemplate>
                    <Button Content="{Binding Path=Header}"/>
                </DataTemplate>
            </ToolBar.ItemTemplate>
        </ToolBar>