StTest/MyTests/Pages/CheckTestResults.xaml

<Page x:Class="MyTests.Pages.CheckTestResults"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:MyTests.Pages"
      mc:Ignorable="d" 
      d:DesignHeight="450" 
      d:DesignWidth="676">
    <Grid Background="{StaticResource color1}">
        <Grid.RowDefinitions>
            <RowDefinition Height="50"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <StackPanel Orientation="Horizontal"
                    HorizontalAlignment="Left">
            <Image Name="TestImg"
                   Source="/MyTests;component/Resources/Approval.png"
                   Margin="7">
            </Image>
            <Label Name="TestName"
                   Content="Название теста"
                   FontSize="25">
            </Label>
        </StackPanel>
        <ListBox Name="TestsListBox"
                 Background="{StaticResource color1}"
                 BorderBrush="{Binding TestsListBox}" 
                 Grid.Row="1">
            <ScrollViewer VerticalScrollBarVisibility="Visible"/>
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Border Width="{Binding Path=ActualWidth, ElementName=TestsListBox}"
                            Height="50"
                            CornerRadius="10"
                            Background="{StaticResource color2}">
                        <StackPanel Orientation="Horizontal">
                            <Label MinWidth="30"
                                   Content="{Binding RelativeSource={RelativeSource Mode=TemplatedParent},
                                      Path=(ItemsControl.AlternationIndex)}"
                                   VerticalContentAlignment="Center"
                                   HorizontalContentAlignment="Center">
                            </Label>
                            <StackPanel>
                                <Label Content="{Binding Questions.Content}"/>
                                <TextBlock>
                                <Run Text="Ответ: " Foreground="LightGray"/>
                                <Run Text="{Binding Answer}" Foreground="White"/>
                                </TextBlock>
                            </StackPanel>
                        </StackPanel>
                        
                    </Border>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
</Page>