<Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Menu>
            <MenuItem Header="Вид">
                <MenuItem Header="Обычный"/>
                <MenuItem Header="Инженерный"/>
                <MenuItem Header="Программист"/>
                <MenuItem Header="Статистика"/>
                <Separator></Separator>
                <MenuItem Header="Журнал"/>
                <MenuItem Header="Группировка цифр по разрядам"/>
                <Separator></Separator>
                <MenuItem Header="Обычный"/>
                <MenuItem Header="Преобразование единиц"/>
                <MenuItem Header="Вычисление даты"/>
                <MenuItem Header="Листы">
                    <MenuItem Header="Ипотека"/>
                    <MenuItem Header="Автолизинг"/>
                    <MenuItem Header="Экономия топлива(миль на галлон)"/>
                    <MenuItem Header="Экономия топлива(л/100 км)"/>
                </MenuItem>
            </MenuItem>
            <MenuItem Header="Правка">
                <MenuItem Header="Копировать"/>
                <MenuItem Header="Вставить"/>
                <Separator></Separator>
                <MenuItem Header="Журнал">
                    <MenuItem Header="Копировать журнал"/>
                    <MenuItem Header="Изменить"/>
                    <MenuItem Header="Отменить правку"/>
                    <MenuItem Header="Очистить"/>
                </MenuItem>
            </MenuItem>
            <MenuItem Header="Справка">
                <MenuItem Header="Просмотреть справку"/>
                <Separator></Separator>
                <MenuItem Header="О программе"/>
            </MenuItem>
        </Menu>
        <Grid Grid.Row="1" ShowGridLines="False" Background="Bisque">
            <Grid.ColumnDefinitions>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="1.8*"></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
            </Grid.RowDefinitions>
            <TextBox Text="0" TextAlignment="Right"
                 FontSize="20pt" Grid.ColumnSpan="5"
                 Margin="5" IsReadOnly="True" Cursor="Arrow">
                <TextBox.ToolTip>
                    <ToolTip>
                        Область вывода результата операции
                    </ToolTip>
                </TextBox.ToolTip>
            </TextBox>
            <Button Content="MC" Margin="5" Focusable="True" Grid.Column="0" Grid.Row="1"/>
            <Button Content="MR" Margin="5" Focusable="True" Grid.Column="1" Grid.Row="1"/>
            <Button Content="MS" Margin="5" Focusable="True" Grid.Column="2" Grid.Row="1"/>
            <Button Content="M+" Margin="5" Focusable="True" Grid.Column="3" Grid.Row="1"/>
            <Button Content="M-" Margin="5" Focusable="True" Grid.Column="4" Grid.Row="1"/>

            <Button Content="BackSp" Margin="5" Focusable="True" Grid.Column="0" Grid.Row="2"/>
            <Button Content="CE" Margin="5" Focusable="True" Grid.Column="1" Grid.Row="2"/>
            <Button Content="C" Margin="5" Focusable="True" Grid.Column="2" Grid.Row="2"/>
            <Button Content="+-" Margin="5" Focusable="True" Grid.Column="3" Grid.Row="2"/>
            <Button Content="Sqrt" Margin="5" Focusable="True" Grid.Column="4" Grid.Row="2"
                ToolTip="Вычисление квадратного корня уровнения"/>
            <Button Content="7" Margin="5" Focusable="True" Grid.Column="0" Grid.Row="3"/>
            <Button Content="8" Margin="5" Focusable="True" Grid.Column="1" Grid.Row="3"/>
            <Button Content="9" Margin="5" Focusable="True" Grid.Column="2" Grid.Row="3"/>
            <Button Content="/" Margin="5" Focusable="True" Grid.Column="3" Grid.Row="3"/>
            <Button Content="%" Margin="5" Focusable="True" Grid.Column="4" Grid.Row="3"/>

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

            <Button Content="1" Margin="5" Focusable="True" Grid.Column="0" Grid.Row="5"/>
            <Button Content="2" Margin="5" Focusable="True" Grid.Column="1" Grid.Row="5"/>
            <Button Content="3" Margin="5" Focusable="True" Grid.Column="2" Grid.Row="5"/>
            <Button Content="-" Margin="5" Focusable="True" Grid.Column="3" Grid.Row="5"/>
            <Button Content="=" Margin="5" Focusable="True" Grid.Column="4" Grid.Row="5"
                Grid.RowSpan="2"/>
            <Button Content="0" Margin="5" Focusable="True" Grid.Column="0" Grid.Row="6"
                Grid.ColumnSpan="2"/>
            <Button Content="," Margin="5" Focusable="True" Grid.Column="2" Grid.Row="6"/>
            <Button Content="+" Margin="5" Focusable="True" Grid.Column="3" Grid.Row="6"/>
        </Grid>
    </Grid>