全屏控制

<UserControl x:Class="SilverlightApplication10.Fullscrean"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    >
    <Grid x:Name="LayoutRoot" Background="White">
<Image x:Name="img1" Source="/imges/dyw_size.jpg"  Stretch="Fill"  ></Image><Button x:Name="bnt1" Width="150" Height="60" Content="全屏模式"> </Button>
    </Grid>
</UserControl>

====================后台===================

Partial Public Class Fullscrean
    Inherits UserControl

    Public Sub New
        InitializeComponent()

 

    End Sub

    Private Sub bnt1_Click(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles bnt1.Click
        Dim content1 As Interop.Content = Application.Current.Host.Content
        content1.IsFullScreen = Not content1.IsFullScreen

    End Sub
End Class

============IMGES应放在ClientBin的img1目录下