WCF Media Player in windows forms??

[i00]

I thought that I would make a WCF based media player in a standard windows form so I whipped up the following:

Public Class Form1
 
    Dim uc As System.Windows.Controls.MediaElement
 
    Private Sub btnLoadAndPlay_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLoadAndPlay.Click
        Dim host As New System.Windows.Forms.Integration.ElementHost
        host.BackColor = Color.Black
        host.Dock = DockStyle.Fill
        Me.Controls.Add(host)
        uc = New System.Windows.Controls.MediaElement
        uc.UnloadedBehavior = Windows.Controls.MediaState.Manual
        host.Child = uc
        uc.Source = New Uri("c:\jukebox\music\0034615D380FF91A-12.mpg")
    End Sub
 
    Private Sub btnStop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStop.Click
        uc.Stop()
    End Sub
 
End Class

The video loads ok when the btnLoadAndPlay button is pressed

However the uc.Stop in the btnStop_Click does not stop the video any ideas why this may be happening?

Thanks in advance
Kris