UploadPage.xaml

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<Page
    x:Class="PhotoSharingApp.Universal.Views.UploadPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:PhotoSharingApp.Universal.Views"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:valueConverters="using:PhotoSharingApp.Universal.ValueConverters"
    xmlns:design="using:PhotoSharingApp.Universal.ViewModels.Design"
    xmlns:controls="using:PhotoSharingApp.Universal.Controls"
    mc:Ignorable="d"
    d:DataContext="{d:DesignInstance design:UploadDesignViewModel, IsDesignTimeCreatable=True}">

    <Page.Resources>
        <valueConverters:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
        <valueConverters:NullToVisibilityConverter x:Key="NullToVisibilityConverter"></valueConverters:NullToVisibilityConverter>
    </Page.Resources>

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition />
        </Grid.RowDefinitions>
        
        <controls:PageHeader Visibility="{Binding Category, Converter={StaticResource NullToVisibilityConverter}}">
            <controls:PageHeader.HeaderContent>
                <TextBlock Text="{Binding Category.Name}" Style="{ThemeResource PageTitleTextBlockStyle}" />
            </controls:PageHeader.HeaderContent>
        </controls:PageHeader>
        
        <Grid Grid.Row="1" x:Name="contentRoot" Margin="0">
            <Grid.RowDefinitions>
                <RowDefinition Height="*" />
                <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>
            <Image x:Name="photo" Source="{Binding ImageSource}"
                   VerticalAlignment="Top" />

            <TextBox Grid.Row="1" PlaceholderText="Enter description"
                     Text="{Binding Comment, Mode=TwoWay}" Margin="12" />
        </Grid>
        <Grid Row="1" Background="{StaticResource BusyIndicatorBackgroundColorBrush}"
              Visibility="{Binding IsBusy, Converter={StaticResource BooleanToVisibilityConverter}}"
              VerticalAlignment="Stretch">
            <ProgressRing IsActive="{Binding IsBusy}" Foreground="{StaticResource AppAccentColorBrush}"
                              Visibility="{Binding IsBusy, Converter={StaticResource BooleanToVisibilityConverter}}" />
        </Grid>
    </Grid>

    <Page.BottomAppBar>
        <CommandBar>
            <AppBarButton Icon="Edit" Label="Choose category" Command="{Binding ChooseCategoryCommand}" />
            <AppBarButton Icon="Send" Label="Upload" Command="{Binding UploadCommand}" />
            <CommandBar.Content>
                <TextBlock Margin="12,14" />
            </CommandBar.Content>
        </CommandBar>
    </Page.BottomAppBar>
</Page>