R29/WpfApp29/UserControls/TaskDoneUserControl.xaml

<UserControl x:Class="WpfApp29.UserControls.TaskDoneUserControl"
             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:WpfApp29.UserControls"
             mc:Ignorable="d" 
             d:DesignHeight="200" d:DesignWidth="500" Width="500" Height="200" 
             BorderThickness="2, 1, 2, 1" BorderBrush="Black" VerticalAlignment="Top">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"></ColumnDefinition>
            <ColumnDefinition Width="3*"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="30"></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition Height="1.25*"></RowDefinition>
        </Grid.RowDefinitions>

        <TextBlock Name="TbTaskName"  Text="{Binding Task.Name}" VerticalAlignment="Center" HorizontalAlignment="Center" FontSize="25" Grid.ColumnSpan="2"></TextBlock>
        <Button Content="???" Grid.ColumnSpan="2" Width="20" Height="20" HorizontalAlignment="Right" Margin="0, 0, 5, 0">
            <Button.ToolTip>
                <ToolTip Background="Wheat">
                    <StackPanel>
                        <TextBlock Name="TbTaskDesc">Всем привет, я подсказка!</TextBlock>
                    </StackPanel>
                </ToolTip>
            </Button.ToolTip>
        </Button>

        <Line Stroke="Black" StrokeThickness="1" X1="15" Y1="0" X2="485" Y2="0" Grid.Row="1" Grid.ColumnSpan="2"></Line>
        <Line Stroke="Black" StrokeThickness="1" X1="15" Y1="0" X2="485" Y2="0" Grid.Row="2" Grid.ColumnSpan="2"></Line>
        <Line Stroke="Black" StrokeThickness="1" X1="15" Y1="0" X2="485" Y2="0" Grid.Row="3" Grid.ColumnSpan="2"></Line>
        <Line Stroke="Black" StrokeThickness="1" X1="15" Y1="0" X2="485" Y2="0" Grid.Row="4" Grid.ColumnSpan="2"></Line>
        <Line Stroke="Black" StrokeThickness="3" X1="125" Y1="0" X2="125" Y2="120" Grid.Row="1" Grid.RowSpan="3"></Line>

        <TextBlock Grid.Row="1" Text="Дата" FontSize="18" HorizontalAlignment="Center" VerticalAlignment="Center"></TextBlock>
        <TextBlock Name="TbTaskDate"  Grid.Column="1" Grid.Row="1" Text="{Binding Task.Date}" FontSize="18" HorizontalAlignment="Center" VerticalAlignment="Center"></TextBlock>

        <TextBlock Grid.Row="2" Text="Создатель" FontSize="18" HorizontalAlignment="Center" VerticalAlignment="Center"></TextBlock>
        <TextBlock Name="TbTaskCreatorLogin"  Grid.Column="1" Grid.Row="2" Text="{Binding Task.UserCreator.Login}" FontSize="18" HorizontalAlignment="Center" VerticalAlignment="Center"></TextBlock>

        <TextBlock Grid.Row="3" Text="Исполнитель" FontSize="18" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0, 0, -5, 0"></TextBlock>
        <TextBlock Name="TbTaskDoerLogin" Grid.Column="1" Grid.Row="3" Text="{Binding Task.UserDoer.Login}" FontSize="18" HorizontalAlignment="Center" VerticalAlignment="Center"></TextBlock>

        <TextBlock Name="ButtonDeleteTask" Grid.Column="0" Grid.ColumnSpan="2" Grid.Row="4" FontSize="18" VerticalAlignment="Center" HorizontalAlignment="Center">
            Это задание было выполнено и 
            <LineBreak />
            сохранено в вашей истории задач
        </TextBlock>

    </Grid>
</UserControl>