wpf,How to show index of Collection in bind?

ListBox had been binded to a Collection o开发者_Python百科f string,I want to Button control to show index of element in collection.

<Style TargetType="ListBoxItem">
        <Setter Property="Margin" Value="2"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate>
                    <Grid Background="{TemplateBinding Background}">
                        <Border BorderThickness="1">
                            <Button Height="20" Width="20" Content="{Binding ???}"  Margin="2">
                            </Button>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        </Style>

Check these links.You may find what you are looking for

WPF: Binding lists in XAML- how can an item know its position in the list?

Numbered listbox

If you follow the approach described by 'Seven' in Numbered listbox the your code should look something like

<Button Height="20" Width="20" Content="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplatedParent.(ItemsControl.AlternationIndex)}"  Margin="2">