---

<Window x:Class="UnitConverter.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Конвертер единиц измерения"
        Height="350" Width="450">

    <Grid Margin="10">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="150"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <TextBlock Grid.Row="0" Grid.Column="0"
                   Text="Категория:"
                   VerticalAlignment="Center"/>

        <ComboBox x:Name="cmbCategory"
                  Grid.Row="0" Grid.Column="1"
                  Margin="5"
                  SelectionChanged="cmbCategory_SelectionChanged"/>

        <TextBlock Grid.Row="1" Grid.Column="0"
                   Text="Из:"
                   VerticalAlignment="Center"/>

        <ComboBox x:Name="cmbFrom"
                  Grid.Row="1" Grid.Column="1"
                  Margin="5"/>

        <TextBlock Grid.Row="2" Grid.Column="0"
                   Text="В:"
                   VerticalAlignment="Center"/>

        <ComboBox x:Name="cmbTo"
                  Grid.Row="2" Grid.Column="1"
                  Margin="5"/>

        <TextBlock Grid.Row="3" Grid.Column="0"
                   Text="Значение:"
                   VerticalAlignment="Center"/>

        <TextBox x:Name="txtInput"
                 Grid.Row="3" Grid.Column="1"
                 Margin="5"/>

        <TextBlock Grid.Row="4" Grid.Column="0"
                   Text="Результат:"
                   VerticalAlignment="Center"/>

        <TextBox x:Name="txtResult"
                 Grid.Row="4" Grid.Column="1"
                 Margin="5"
                 IsReadOnly="True"/>

        <StackPanel Grid.Row="5" Grid.ColumnSpan="2"
                    Orientation="Horizontal"
                    HorizontalAlignment="Center"
                    Margin="10">

            <Button Content="Конвертировать"
                    Width="140"
                    Margin="5"
                    Click="Convert_Click"/>

            <Button Content="Очистить"
                    Width="100"
                    Margin="5"
                    Click="Clear_Click"/>
        </StackPanel>
    </Grid>
</Window>