Как получить значение всех элементов ItemsControl WPF

Возникла проблема, имеются множество TextBox-ов, в которых есть значения, все эти TextBox-ы находятся в ItemsControl. Необходимо получить значения всех этих TextBox-ов и передать в функцию из другого класса. Пробовал использовать методы ItemsSource и Items, но при дебаге вижу, что контейнеры null.

XAML код:

<Grid Background="White">
        <Grid.RowDefinitions>
            <RowDefinition Height="100"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="35"/>
        </Grid.RowDefinitions>
        
        <StackPanel Orientation="Vertical" VerticalAlignment="Center" HorizontalAlignment="Center" Grid.Row="1">
            <ItemsControl x:Name="NFR">
                    <ItemsControl.ItemTemplate>
                        <DataTemplate>
                        <WrapPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
                            <StackPanel Orientation="Vertical">
                                <StackPanel>
                                    <TextBlock Text="ID аккаунта" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="id_account" IsReadOnly="True" Width="200" Height="30" Text="{Binding id_account}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS" Foreground="DimGray">
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                                <StackPanel  Margin="0,10">
                                    <TextBlock Text="ID клиента" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="id_client" IsReadOnly="True" Width="200" Height="30" Text="{Binding id_client}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS" Foreground="DimGray">
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                                <StackPanel>
                                    <TextBlock Text="Логин" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="login" Width="200" Height="30" Text="{Binding login}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS">
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                                <StackPanel  Margin="0,10">
                                    <TextBlock Text="Пароль" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="password" Width="200" Height="30" Text="{Binding password}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS">
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                                <StackPanel>
                                    <TextBlock Text="Имя" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="name" Width="200" Height="30" Text="{Binding name_}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS">
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                                <StackPanel  Margin="0,10">
                                    <TextBlock Text="Фамилия" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="second_name" Width="200" Height="30" Text="{Binding second_name}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS" >
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                                <StackPanel>
                                    <TextBlock Text="Отчество" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="patronymic" Width="200" Height="30" Text="{Binding patronymic}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS">
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                            </StackPanel>
                            <StackPanel Orientation="Vertical" Margin="20,0">
                                <StackPanel>
                                    <TextBlock Text="Дата рождения" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="date_birthday_textbox" Width="200" Height="30" Text="{Binding date_birthday}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS">
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                                <StackPanel  Margin="0,10">
                                    <TextBlock Text="Серия паспорта" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="seria_passport" Width="200" Height="30" Text="{Binding series_passport}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS">
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                                <StackPanel>
                                    <TextBlock Text="Номер паспорта" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="number_passport" Width="200" Height="30" Text="{Binding number_passport}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS">
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                                <StackPanel  Margin="0,10">
                                    <TextBlock Text="Номер телефона" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="number_phone" Width="200" Height="30" Text="{Binding number_phone}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS">
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                                <StackPanel>
                                    <TextBlock Text="Электронная почта" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="email" Width="200" Height="30" Text="{Binding email}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS">
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                                <StackPanel  Margin="0,10">
                                    <TextBlock Text="Номер полиса" FontSize="12" FontFamily="Comic Sans MS" Foreground="#498C51"/>
                                    <TextBox x:Name="number_policy" Width="200" Height="30" Text="{Binding number_policy}" Background="{x:Null}" BorderBrush="#498C51" BorderThickness="2" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="15" FontFamily="Comic Sans MS">
                                        <TextBox.Resources>
                                            <Style TargetType="Border">
                                                <Setter Property="CornerRadius" Value="10"/>
                                            </Style>
                                        </TextBox.Resources>
                                    </TextBox>
                                </StackPanel>
                            </StackPanel>
                        </WrapPanel>
                    </DataTemplate>
                </ItemsControl.ItemTemplate>
            </ItemsControl>
            
        </StackPanel>
        <Grid Grid.Row="3" Background="#76E383">
            <StackPanel Orientation="Horizontal" VerticalAlignment="Center" HorizontalAlignment="Center">
                <Button x:Name="save" Content="СОХРАНИТЬ" Background="#498C51" Width="130" Height="30" FontSize="15" FontFamily="Comic Sans MS" Margin="0,0,10,0" Click="save_Click" BorderBrush="{x:Null}">
                    <Button.Resources>
                        <Style TargetType="Border">
                            <Setter Property="CornerRadius" Value="10"/>
                        </Style>
                    </Button.Resources>
                </Button>
                <Button x:Name="back" Content="НАЗАД" Background="#498C51" Width="130" Height="30" FontSize="15" FontFamily="Comic Sans MS" Click="back_Click" IsCancel="True" BorderBrush="{x:Null}">
                    <Button.Resources>
                        <Style TargetType="Border">
                            <Setter Property="CornerRadius" Value="10"/>
                        </Style>
                    </Button.Resources>
                </Button>
            </StackPanel>
        </Grid>
    </Grid>

CS код:

using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Session1.Classes;

namespace Session1.Pages
{
    /// <summary>
    /// Логика взаимодействия для RedactorClient.xaml
    /// </summary>
    public partial class RedactorClient : Page
    {
        bool rewrite;
        public RedactorClient(string id, int type_polic)
        {
            InitializeComponent();
            if(id != null)
            {
                rewrite = true;
                NFR.ItemsSource = Load.getDataClient(id);
                comboboxPolicy.SelectedIndex = type_polic;
            }
            else
            {
                rewrite = false;
            }
        }

        private void back_Click(object sender, RoutedEventArgs e)
        {
            NavigationService.Navigate(new MenuAdministator());
        }

        private void save_Click(object sender, RoutedEventArgs e)
        {
            if (rewrite == true)
            {
                Load.saveClient(NFR.ToString(), true);
            }
            else
            {
                Load.saveClient(NFR.ToString(), false);
            }
        }
    }
}

Фоточки дебага:

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