using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp1
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Recogition_btn_Click(object sender, RoutedEventArgs e)
        {

        }

        private void Learning_btn_Click(object sender, RoutedEventArgs e)
        {

        }

        private void Test_btn_Click(object sender, RoutedEventArgs e)
        {

        }

        private  void Border_Click(object sender, RoutedEventArgs e)
        {
            Button btn = (Button)e.OriginalSource;
            if (btn.Background == Brushes.Gray)
            {
                btn.Background = Brushes.Orange;
            }
            else
                btn.Background = Brushes.Gray;
        }
    }
}




<Window x:Class="WpfApp1.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:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Button x:Name="Recogition_btn" Content="Распознавание" HorizontalAlignment="Left" Margin="604,109,0,0" VerticalAlignment="Top" Height="38" Width="108" Click="Recogition_btn_Click"/>
        <Button x:Name="Learning_btn" Content="Обучение" HorizontalAlignment="Left" Margin="604,165,0,0" VerticalAlignment="Top" Height="34" Width="108" Click="Learning_btn_Click"/>
        <Button x:Name="Test_btn" Content="Тест" HorizontalAlignment="Left" Margin="604,217,0,0" VerticalAlignment="Top" Height="32" Width="108" Click="Test_btn_Click"/>
        <Border ButtonBase.Click="Border_Click" BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="381" Margin="130,0,0,0" VerticalAlignment="Center" Width="296">
            <Grid >
                <Grid.RowDefinitions>
                    <RowDefinition> </RowDefinition>
                    <RowDefinition></RowDefinition>
                    <RowDefinition></RowDefinition>
                    <RowDefinition></RowDefinition>
                    <RowDefinition></RowDefinition>
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition></ColumnDefinition>
                    <ColumnDefinition></ColumnDefinition>
                    <ColumnDefinition></ColumnDefinition>
                </Grid.ColumnDefinitions>
                <Button Background="Gray"  Grid.Column="1"></Button>
                <Button Background="Gray"  Grid.Column="2"></Button>
                <Button Background="Gray"  Grid.Row="1"></Button>
                <Button Background="Gray"  Grid.Row="2"></Button>
                <Button Background="Gray"  Grid.Row="3"></Button>
                <Button Background="Gray"  Grid.Row="4"></Button>
                <Button Background="Gray"  Grid.Column="1" Grid.Row="1"></Button>
                <Button Background="Gray"  Grid.Column="1" Grid.Row="3"></Button>
                <Button Background="Gray"  Grid.Column="1" Grid.Row="4"></Button>
                <Button Background="Gray"
                        Grid.Column="2" Grid.Row="1"></Button>
                <Button Background="Gray"  Grid.Column="2" Grid.Row="2"></Button>
                <Button Background="Gray"  Grid.Column="2" Grid.Row="3"></Button>
                <Button Background="Gray"  Grid.Column="2" Grid.Row="4"></Button>
                <Button Background="Gray" Grid.Column="1" Grid.Row="2"></Button>
                <Button Background="Gray"  ></Button>

            </Grid>
        </Border>
    </Grid>
</Window>