保持元素在全屏UWP应用程序中显示

下面是我的设计，其中包含媒体元素，播放，暂停，全屏和搜索程序。

<MediaElement x:Name="VideosMediaElement" VerticalAlignment="Top"
              Height="250" Width="355" Margin="0,20,0,0"
              BufferingProgressChanged="VideosMediaElement_BufferingProgressChanged"
              RealTimePlayback="True"
              />
<Grid x:Name="mediaGrid">
    <Border VerticalAlignment="Bottom" Height="60" Background="Black"
            Opacity="0.1">
    </Border>
    <Image x:Name="PlayIcon" Source="Assets/Play-icon.png"
           Height="35" HorizontalAlignment="Left" VerticalAlignment="Bottom"
           Margin="3,0,0,10" Visibility="Collapsed" Tapped="PlayIcon_Tapped">
    </Image>

    <Image x:Name="PauseIcon" Source="Assets/Pause.png"
           Height="35" HorizontalAlignment="Left" VerticalAlignment="Bottom"
           Margin="3,0,0,10" Tapped="PauseIcon_Tapped" Visibility="Visible">
    </Image>

    <TextBlock x:Name="duration" Foreground="White" VerticalAlignment="Bottom"
               Margin="43,0,0,20">
    </TextBlock>

    <ProgressBar x:Name="videoProgressBar" VerticalAlignment="Bottom"
                 Margin="15 0 10 25" Foreground="DarkBlue" Background="Gray"
                 Width="180" Height="10" Minimum="0"
                 Maximum="{Binding Path=NaturalDuration.TimeSpan.TotalSeconds,
                                   Mode=TwoWay, 
                                   ElementName=VideosMediaElement}"
                 Value="{Binding Path=Position.TotalSeconds, Mode=TwoWay,
                                 ElementName=VideosMediaElement}"
                 Tapped="videoProgressBar_Tapped"
                 />

    <TextBlock x:Name="maximumDuration" Foreground="White" Margin="0,0,40,20"
               VerticalAlignment="Bottom" HorizontalAlignment="Right">
    </TextBlock>

    <Image x:Name="ExpandEnabled" Source="Assets/Fullscreen.png"
           Tapped="Zoom_Tapped" Height="35" Margin="0 0 3 10"
           HorizontalAlignment="Right" VerticalAlignment="Bottom">
    </Image>
</Grid>

如果单击右侧的全屏图标，视频将显示为带有播放，暂停，搜寻器和全屏按钮的全屏。

VideosMediaElement.IsFullWindow = true;

<MediaElement x:Name="VideosMediaElement" VerticalAlignment="Top"
              Height="300" Width="360"
              BufferingProgressChanged="VideosMediaElement_BufferingProgressChanged"
              AreTransportControlsEnabled="True">
    <MediaElement.TransportControls>
         <MediaTransportControls IsCompact="True" IsZoomButtonVisible="False"
                                 IsZoomEnabled="False"
                                 IsPlaybackRateButtonVisible="True"
                                 IsPlaybackRateEnabled="True"
                                 />
    </MediaElement.TransportControls>
</MediaElement>

该视频在全窗口中播放，但是当我设置该IsWindowFull属性时，播放，暂停和搜寻器处于隐藏状态。当媒体元素处于全屏状态时，如何显示这些控件？