MainWindow.xaml

<Window x:Class="TestCase.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:TestCase"
        mc:Ignorable="d"
        Title="TestCase" Height="700" Width="1200">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <ScrollViewer Name="Viewer" VerticalScrollBarVisibility="Hidden">
            <Canvas HorizontalAlignment="Center" VerticalAlignment="Center" Name="Canvas" Background="Red" Width="1" Height="1"/>
        </ScrollViewer>
        <Grid Grid.Row="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <StackPanel>
                <StackPanel Orientation="Horizontal">
                    <Button Content="Выбрать входные файлы" Padding="10px" Click="OnClickSelectInputFile"/>
                    <Button Name="ShowMarkedPointsBtn" Content="Открыть список точек" Padding="10px" Click="OnClickOpenMarkedPointsList" Visibility="Hidden"/>
                </StackPanel>
                <TextBlock>
                    Формат входных данных: ключ=x,y|x;y|x,y<LineBreak/>
                    ключи: s, l (s-square, l-line)<LineBreak/>
                    Пример: s=0,0|0,2|2,2|2,0<LineBreak/>
                </TextBlock>
            </StackPanel>
            <ListBox Name="ListBox" Grid.Column="1" Height="100px"/>
        </Grid>
    </Grid>
</Window>