How to get checkbox from a listbox in windows phone

I have 10 checkbox in a listbox in windows phone. My xaml file for checkbox into listbox is given below:

<ListBox x:Name="notificationSettingsListBox" Grid.Row="1"   Margin="20,20,20,20" Background="#e79e38"  >
        <ListBox.ItemTemplate>
            <DataTemplate>
                <Grid Background="#055cc3" Width="500" Height="200">
                    <StackPanel Orientation="Vertical">
                        <TextBlock Text="{Binding channel_name}" Foreground="White" FontSize="31" TextAlignment="Left" TextWrapping="Wrap"  />
                        <CheckBox  Content="Enable Notification"  Checked="pushNotiOnCheckBox_Checked" Unchecked="pushNotiOnCheckBox_Unchecked"/>
                    </StackPanel>

                </Grid>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

How can i access all checkbox one by one like checkbox1.checked=true ,checkbox2.checked=false... ???