PicView/PicView/UI/UserControls/Buttons/MinButton.xaml

<UserControl
    x:Class="PicView.UI.UserControls.MinButton"
    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"
        Margin="5,0,0,0"
        VerticalAlignment="Center"
        BorderThickness="0"
        DockPanel.Dock="Right"
        FocusVisualStyle="{x:Null}"
        Focusable="False"
        ToolTip="Minimize">
        <Button.Background>
            <SolidColorBrush x:Name="MinButtonBrush" />
        </Button.Background>
        <Path
            Data="F1M0,6L0,9 9,9 9,6 0,6z"
            Fill="{StaticResource MainColorBrush}"
            SnapsToDevicePixels="True" />
    </Button>
</UserControl>