FeedbackFormView.xaml

 <StackPanel Width="300" VerticalAlignment="Center">
    <TextBlock Text="Feedback" Style="{StaticResource TitleTextBlockStyle}" />
    <TextBox Text="{x:Bind ViewModel.Title, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
             MaxLength="{x:Bind ViewModel.TitleLengthMax}" 
             PlaceholderText="Title" />
    <TextBlock Style="{StaticResource CaptionTextBlockStyle}" Margin="0 5">
        <Run Text="{x:Bind ViewModel.TitleLength, Mode=OneWay}"/>
        <Run Text="letters used from"/>
        <Run Text="{x:Bind ViewModel.TitleLengthMax}"/>
    </TextBlock>
    <TextBox Text="{x:Bind ViewModel.Message, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
             MaxLength="{Binding MessageLengthMax}"
             PlaceholderText="Message" />
    <TextBlock Style="{StaticResource CaptionTextBlockStyle}" Margin="0 5">
        <Run Text="{x:Bind ViewModel.MessageLength, Mode=OneWay}"/>
        <Run Text="letters used from"/>
        <Run Text="{x:Bind ViewModel.MessageLengthMax}"/>
    </TextBlock>
    <ComboBox Width="170" SelectedIndex="{x:Bind ViewModel.Section, Mode=TwoWay}">
        <ComboBoxItem Content="User Interface"/>
        <ComboBoxItem Content="Audio"/>
        <ComboBoxItem Content="Video"/>
        <ComboBoxItem Content="Voice"/>
    </ComboBox>
    <Grid Margin="0 5">
        <Grid.ColumnDefinitions>
            <ColumnDefinition />
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <CheckBox IsChecked="{x:Bind ViewModel.Idea, Mode=TwoWay}"
                  Grid.Column="0" Content="Idea" />
        <CheckBox IsChecked="{x:Bind ViewModel.Issue, Mode=TwoWay}"
                  Grid.Column="1" Content="Issue" />
    </Grid>
    <TextBlock Text="Please, fill in all the form fields." 
               Visibility="{x:Bind (Visibility)ViewModel.HasErrors, Mode=OneWay}" 
               Foreground="{ThemeResource SystemControlForegroundAccentBrush}"/>
    <Button Width="150" Content="Send Feedback" Margin="0 5"
            Command="{x:Bind ViewModel.Submit}" />
</StackPanel>