How do I select single check box inside the listbox

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C#

WPF

I work in wpf project in that i have a checkbox inside of it one listbox. i want single selection in checkbox .Please any one help. This is my code

<ListBox  Name="lstbxFieldName"  HorizontalContentAlignment="Left" Height="170" Width="320"  Style="{StaticResource lstBoxStyle}" TabIndex="4">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal" Margin="20,0,0,0" ScrollViewer.VerticalScrollBarVisibility="Visible">
                        <CheckBox Name="chkuser"  Tag="{Binding FieldValue}" Content="{Binding FieldName}" HorizontalAlignment="Left" Margin="5,5,0,0"/>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>