jellyfin/MediaBrowser.UI/Controls/NotificationMessage.xaml

<controls:BaseUserControl x:Class="MediaBrowser.UI.Controls.NotificationMessage"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
                 xmlns:Controls="clr-namespace:MediaBrowser.UI.Controls"
                          xmlns:controls="clr-namespace:MediaBrowser.UI.Controls;assembly=MediaBrowser.UI.Controls"
                          mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid Style="{StaticResource NotificationContentStyle}">
        <Grid Style="{StaticResource NotificationContentInnerStyle}">

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

            <Grid.RowDefinitions>
                <RowDefinition Height="auto"></RowDefinition>
                <RowDefinition Height="auto"></RowDefinition>
                <RowDefinition Height="auto"></RowDefinition>
            </Grid.RowDefinitions>

            <Image Grid.Row="0" Grid.RowSpan="3" Grid.Column="0" Style="{StaticResource NotificationButtonImage}"></Image>

            <TextBlock x:Name="txtCaption" Text="{Binding Caption}" Style="{StaticResource NotificationCaptionStyle}" Grid.Row="0" Grid.Column="1"></TextBlock>

            <Grid x:Name="pnlContent" HorizontalAlignment="Stretch" Grid.Row="1" Grid.Column="1">

            </Grid>
        </Grid>
    </Grid>
</controls:BaseUserControl>