UserControl1.xaml

<UserControl x:Name="UserControl" x:Class="PolyvPlayerDemoWinform.UserControl1"
             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:local="clr-namespace:PolyvPlayerDemoWinform"
             xmlns:ffme="clr-namespace:PolyvPlayerSDK;assembly=PolyvPlayerSDK"
             mc:Ignorable="d" Background="Black" >
    <Grid>
        <ffme:MediaElement Name="Media"  Grid.Row="0" Grid.Column="0" Padding="0,0,0,0" Margin="0,0,0,0" VerticalAlignment="Center" />
        <local:ScrollingTextControl Height="52" HorizontalAlignment="Left" Margin="0,10,0,0" x:Name="scrollingTextControl1" VerticalAlignment="Top" Width="80" Foreground="Red" Content="polyv" RunSpeed="500" FontSize="20" TextSource="" />
    </Grid>

</UserControl>