entrance-testing/EntranseTesting/Views/EditorViews/EditorMatchesMultiply.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:conv="clr-namespace:EntranseTesting.Converter;assembly=EntranseTesting"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="EntranseTesting.EditorMatchesMultiply"
             x:DataType="vm:MainWindowViewModel"
             xmlns:vm="using:EntranseTesting.ViewModels">
  <UserControl.Resources>
    <conv:ItemCAFSConverter x:Key="ItemCAFSConverter"/>
  </UserControl.Resources>
  <StackPanel Orientation="Vertical" Spacing="10">
    <TextBlock Text="Элементы" VerticalAlignment="Center" Margin="0 10"/>
    <ItemsRepeater ItemsSource="{Binding EditorPages.TaskEditorPage.MatchesMultiplyElement}"
                               HorizontalAlignment="Stretch"
                               VerticalAlignment="Stretch">
      <ItemsRepeater.Layout>
        <StackLayout Spacing="10" Orientation="Vertical"/>
      </ItemsRepeater.Layout>
      <ItemsRepeater.ItemTemplate>
        <DataTemplate>
          <Border BorderBrush="LightCoral" BorderThickness="0 0 0 1">
            <StackPanel Orientation="Horizontal" Spacing="10" HorizontalAlignment="Stretch"
                        Name="ElementText">
              <Button Content="x"
                      Command="{Binding  $parent[Window].((vm:MainWindowViewModel)DataContext).EditorPages.TaskEditorPage.DeleteItem}"
                      CommandParameter="{Binding}"
                      IsVisible="{Binding $parent[Window].((vm:MainWindowViewModel)DataContext).EditorPages.TaskEditorPage.NoEditing}"
                      VerticalAlignment="Center" HorizontalAlignment="Center"/>
              <TextBox Width="350" Height="80"
                       Margin="10 0"
                       Text="{Binding Text}"
                       VerticalContentAlignment="Top"/>
              <StackPanel Orientation="Vertical">
                <ItemsRepeater ItemsSource="{Binding ElementEditor}">
                  <ItemsRepeater.Layout>
                    <StackLayout Spacing="5" Orientation="Vertical"/>
                  </ItemsRepeater.Layout>
                  <ItemsRepeater.ItemTemplate>
                    <DataTemplate>
                      <StackPanel Orientation="Horizontal" Spacing="10"
                                  Name="ElementChoosing">
                        <Button Content="x"
                                Command="{Binding  $parent[Window].((vm:MainWindowViewModel)DataContext).EditorPages.TaskEditorPage.DeleteItemCAFS}"
                                CommandParameter="{Binding}"
                                IsVisible="{Binding $parent[Window].((vm:MainWindowViewModel)DataContext).EditorPages.TaskEditorPage.NoEditing}"
                                VerticalAlignment="Center">
                          <Button.CommandParameter>
                            <MultiBinding Converter="{StaticResource ItemCAFSConverter}">
                              <Binding ElementName="ElementText" Path="DataContext"/>
                              <Binding ElementName="ElementChoosing" Path="DataContext" />
                            </MultiBinding>
                          </Button.CommandParameter>
                        </Button>
                        <CheckBox IsChecked="{Binding Correctly}"
                                  VerticalAlignment="Center"/>
                        <TextBox Text="{Binding Name}"
                                 Width="350" Height="80"/>
                      </StackPanel>
                    </DataTemplate>
                  </ItemsRepeater.ItemTemplate>
                </ItemsRepeater>
                <Button Content="Добавить элемент выбора" Margin="10 0"
                        IsVisible="{Binding $parent[Window].((vm:MainWindowViewModel)DataContext).EditorPages.TaskEditorPage.NoEditing}"
                        Command="{Binding $parent[Window].((vm:MainWindowViewModel)DataContext).EditorPages.TaskEditorPage.AddItemCAFS}"
                        CommandParameter="{Binding}"
                        VerticalAlignment="Center" HorizontalAlignment="Center"/>
              </StackPanel>
            </StackPanel>           
          </Border>
        </DataTemplate>
      </ItemsRepeater.ItemTemplate>
    </ItemsRepeater>

    <Button Content="Добавить элемент"
            IsVisible="{Binding EditorPages.TaskEditorPage.NoEditing}"
            Command="{Binding  $parent[Window].((vm:MainWindowViewModel)DataContext).EditorPages.TaskEditorPage.AddItem}"
            HorizontalAlignment="Center"/>
  </StackPanel>
</UserControl>