jellyfin/MediaBrowser.UI/Controls/WindowCommands.xaml

<UserControl x:Class="MediaBrowser.UI.Controls.WindowCommands"
             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" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">

    <UserControl.Resources>

        <Style TargetType="StackPanel" x:Key="WindowCommandsPanel">
            <Setter Property="Orientation" Value="Horizontal"/>
            <Setter Property="HorizontalAlignment" Value="Right"/>
        </Style>

        <Style TargetType="Button" x:Key="WebdingsButton" BasedOn="{StaticResource ImageButton}">
            <Setter Property="Margin" Value="0 0 15 0"/>
            <Setter Property="KeyboardNavigation.IsTabStop" Value="false"/>
        </Style>

        <Style TargetType="TextBlock" x:Key="WebdingsTextBlock">
            <Setter Property="FontFamily" Value="Webdings"/>
            <Setter Property="FontSize" Value="14"/>
            <Setter Property="Foreground" Value="{StaticResource DefaultForeground}"/>
        </Style>

        <Style TargetType="Button" x:Key="MinimizeApplicationButton" BasedOn="{StaticResource WebdingsButton}">
            <Setter Property="ToolTip" Value="Minimize"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate>
                        <TextBlock Style="{StaticResource WebdingsTextBlock}">0</TextBlock>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <Style TargetType="Button" x:Key="MaximizeApplicationButton" BasedOn="{StaticResource WebdingsButton}">
            <Setter Property="ToolTip" Value="Maximize"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate>
                        <TextBlock Style="{StaticResource WebdingsTextBlock}">1</TextBlock>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=WindowState, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" Value="Maximized">
                    <Setter Property="Visibility" Value="Collapsed" />
                </DataTrigger>
            </Style.Triggers>
        </Style>

        <Style TargetType="Button" x:Key="UndoMaximizeApplicationButton" BasedOn="{StaticResource WebdingsButton}">
            <Setter Property="Visibility" Value="Collapsed"/>
            <Setter Property="ToolTip" Value="Restore"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate>
                        <TextBlock Style="{StaticResource WebdingsTextBlock}">2</TextBlock>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=WindowState, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" Value="Maximized">
                    <Setter Property="Visibility" Value="Visible" />
                </DataTrigger>
            </Style.Triggers>
        </Style>

        <Style TargetType="Button" x:Key="CloseApplicationButton" BasedOn="{StaticResource WebdingsButton}">
            <Setter Property="ToolTip" Value="Close"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate>
                        <TextBlock Style="{StaticResource WebdingsTextBlock}">r</TextBlock>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

    </UserControl.Resources>

    <StackPanel Style="{StaticResource WindowCommandsPanel}">
        <Button x:Name="MinimizeApplicationButton" Style="{StaticResource MinimizeApplicationButton}"></Button>
        <Button x:Name="MaximizeApplicationButton" Style="{StaticResource MaximizeApplicationButton}"></Button>
        <Button x:Name="UndoMaximizeApplicationButton" Style="{StaticResource UndoMaximizeApplicationButton}"></Button>
        <Button x:Name="CloseApplicationButton" Style="{StaticResource CloseApplicationButton}"></Button>
    </StackPanel>

</UserControl>