PicView/PicView/UI/UserControls/Buttons/FullscreenButton.xaml

<UserControl
    x:Class="PicView.UI.UserControls.FullscreenButton"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Button
        x:Name="TheButton"
        Width="33"
        Height="33"
        VerticalAlignment="Center"
        BorderThickness="0"
        DockPanel.Dock="Right"
        FocusVisualStyle="{x:Null}"
        Focusable="False"
        ToolTip="Fullscreen">
        <Button.Background>
            <SolidColorBrush x:Name="FullscreenButtonBrush" />
        </Button.Background>
        <Path
            x:Name="MaxButtonPath"
            Width="12"
            Height="12"
            Data="M405.34 405.332H106.66V106.668H240V64H106.66C83.191 64 64 83.197 64 106.668v298.664C64 428.803 83.191 448 106.66 448h298.68c23.469 0 42.66-19.197 42.66-42.668V272h-42.66v133.332zM288 64v42.668h87.474L159.999 322.133l29.866 29.866 215.476-215.47V224H448V64H288z"
            Fill="{StaticResource MainColorBrush}"
            SnapsToDevicePixels="True"
            Stretch="Fill" />
    </Button>
</UserControl>