FichaWindow.xaml

<Window x:Class="WPFteste.FichaWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WPFteste"
        mc:Ignorable="d"
        Title="FichaWindow" Height="678" Width="515" ResizeMode="NoResize" WindowStartupLocation="CenterScreen">
    <Grid>

        <Border>
            <Border.Background>
                <LinearGradientBrush StartPoint="0,1" EndPoint="1,1">
                    <GradientStop Color="Black"/>
                </LinearGradientBrush>
            </Border.Background>
            <Grid>
                
            </Grid>
        </Border>
        <Image Margin="0,0,0,-16" Source="/Image4.png" Stretch="Fill"/>

    </Grid>
</Window>