<Grid ShowGridLines="False">
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Menu>
            <MenuItem Header="Вид">
                <MenuItem Header="Обычный"></MenuItem>
                <MenuItem Header="Инженерный"></MenuItem>
                <MenuItem Header="Программист"></MenuItem>
                <MenuItem Header="Статистика"></MenuItem>
                <Separator></Separator>
                <MenuItem Header="Журнал"></MenuItem>
                <MenuItem Header="Группировка цифр по разрядам"></MenuItem>
                <Separator></Separator>
                <MenuItem Header="Обычный"></MenuItem>
                <MenuItem Header="Преобразование единиц"></MenuItem>
                <MenuItem Header="Вычисление дат"></MenuItem>
                <MenuItem Header="Листы">
                    <MenuItem Header="Ипотека"></MenuItem>
                    <MenuItem Header="Автолизинг"></MenuItem>
                    <MenuItem Header="Экономия топлива(Миль за галлон)"></MenuItem>
                    <MenuItem Header="Экономия топлива(л/100 км)"></MenuItem>
                </MenuItem>
            </MenuItem>
            <MenuItem Header="Правка">
                <MenuItem Header="Копировать"></MenuItem>
                <MenuItem Header="Вставить"></MenuItem>
                <Separator></Separator>
                <MenuItem Header="Журнал"></MenuItem>
            </MenuItem>
            <MenuItem Header="Справка">
                <MenuItem Header="Просмотреть справку"></MenuItem>
                <MenuItem Header="О программе"></MenuItem>
            </MenuItem>
        </Menu>
        <Grid ShowGridLines="False" Grid.Row="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="2*"></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
            </Grid.RowDefinitions>
            <Grid Grid.ColumnSpan="5">
                <Grid.RowDefinitions>
                    <RowDefinition></RowDefinition>
                    <RowDefinition Height="2*"></RowDefinition>
                </Grid.RowDefinitions>
                <TextBlock x:Name="Func_calc" Margin="5 5 5 0"/>
                <TextBox x:Name="Tablo" Grid.Row="1" Margin="5 0 5 0" Text="0"
                     IsReadOnly="True" TextAlignment="Right" FontSize="20"
                     Cursor="Arrow"/>
            </Grid>
            <Button Content="MC" Margin="5" Focusable="False" Grid.Column="0" Grid.Row="1"/>
            <Button Content="MR" Margin="5" Focusable="False" Grid.Column="1" Grid.Row="1"/>
            <Button Content="MS" Margin="5" Focusable="False" Grid.Column="2" Grid.Row="1"/>
            <Button Content="M+" Margin="5" Focusable="False" Grid.Column="3" Grid.Row="1"/>
            <Button Content="M-" Margin="5" Focusable="False" Grid.Column="4" Grid.Row="1"/>

            <Button Content="BackSp" Margin="5" Focusable="False" Grid.Column="0" Grid.Row="2"
                    Click="Cancel_mode"/>
            <Button Content="CE" Margin="5" Focusable="False" Grid.Column="1" Grid.Row="2"
                    Click="Cancel_mode"/>
            <Button Content="C" Margin="5" Focusable="False" Grid.Column="2" Grid.Row="2"
                    Click="Cancel_mode"/>
            <Button Content="+-" Margin="5" Focusable="False" Grid.Column="3" Grid.Row="2"/>
            <Button Content="Sqrt" Margin="5" Focusable="False" Grid.Column="4" Grid.Row="2"/>

            <Button Content="7" Margin="5" Focusable="False" Grid.Column="0" Grid.Row="3"
                    Click="Numbers"/>
            <Button Content="8" Margin="5" Focusable="False" Grid.Column="1" Grid.Row="3"
                    Click="Numbers"/>
            <Button Content="9" Margin="5" Focusable="False" Grid.Column="2" Grid.Row="3"
                    Click="Numbers"/>
            <Button Content="/" Margin="5" Focusable="False" Grid.Column="3" Grid.Row="3"/>
            <Button Content="%" Margin="5" Focusable="False" Grid.Column="4" Grid.Row="3"/>

            <Button Content="4" Margin="5" Focusable="False" Grid.Column="0" Grid.Row="4"
                    Click="Numbers"/>
            <Button Content="5" Margin="5" Focusable="False" Grid.Column="1" Grid.Row="4"
                    Click="Numbers"/>
            <Button Content="6" Margin="5" Focusable="False" Grid.Column="2" Grid.Row="4"
                    Click="Numbers"/>
            <Button Content="*" Margin="5" Focusable="False" Grid.Column="3" Grid.Row="4"/>
            <Button Content="1/x" Margin="5" Focusable="False" Grid.Column="4" Grid.Row="4"/>

            <Button Content="1" Margin="5" Focusable="False" Grid.Column="0" Grid.Row="5"
                    Click="Numbers"/>
            <Button Content="2" Margin="5" Focusable="False" Grid.Column="1" Grid.Row="5"
                    Click="Numbers"/>
            <Button Content="3" Margin="5" Focusable="False" Grid.Column="2" Grid.Row="5"
                    Click="Numbers"/>
            <Button Content="-" Margin="5" Focusable="False" Grid.Column="3" Grid.Row="5"/>
            <Button Content="=" Margin="5" Focusable="False" Grid.Column="4" Grid.Row="5"
                Grid.RowSpan="2" />

            <Button Content="0" Margin="5" Focusable="False" Grid.Column="0" Grid.Row="6"
                Grid.ColumnSpan="2" Click="Numbers"/>
            <Button Content="," Margin="5" Focusable="False" Grid.Column="2" Grid.Row="6"
                    Click="Comma_Click"/>
            <Button Content="+" Margin="5" Focusable="False" Grid.Column="3" Grid.Row="6"/>

        </Grid>
    </Grid>