GraphDrawer/GraphDrawer/ChoiceMode.xaml

<Window x:Class="GraphDrawer.ChoiceMode"
        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"
        mc:Ignorable="d"
        Title="Graph Drawer" Height="250" ResizeMode="NoResize" Width="300">
    <Window.Resources>
        <Style TargetType="Button">
            <Setter Property="Background" Value="White"/>
            <Setter Property="FontSize" Value="32"/>
        </Style>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Button Content="Генерация графа" Click="Button_Click"/>
        <Button Content="Ввод графа" Grid.Row="1" Click="Button_Click_1"/>
    </Grid>
</Window>