<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
   <Grid>
      <Grid.ColumnDefinitions>
         <ColumnDefinition Width="Auto" />
         <ColumnDefinition Width="*" />
      </Grid.ColumnDefinitions>
 
      <StackPanel Margin="5">
         <Button x:Name="btnAnwendung1" Content="Anwendung 1" _
           Click="btnAnwendung1_Click" />
         <Button x:Name="btnAnwendung2" Content="Anwendung 2" _
         Click="btnAnwendung2_Click"/>
         <Button x:Name="btnAnwendung3" Content="Anwendung 3" _
         Click="btnAnwendung3_Click"/>
         <Button x:Name="btnAnwendung4" Content="Anwendung 4" _
         Click="btnAnwendung4_Click"/>
      </StackPanel>
 
      <Frame x:Name="MainFrame" Grid.Column="2" 
             NavigationUIVisibility="Hidden" 
             Source="Page1.xaml" Margin="5"/>
   </Grid>
</Window>

Class MainWindow 
   Private Sub btnAnwendung1_Click(sender As System.Object, e As _
     System.Windows.RoutedEventArgs)
      Me.MainFrame.Source = New Uri("Page1.xaml", UriKind.RelativeOrAbsolute)
   End Sub
 
   Private Sub btnAnwendung2_Click(sender As System.Object, e As _
     System.Windows.RoutedEventArgs)
      Me.MainFrame.Source = New Uri("Page2.xaml", UriKind.RelativeOrAbsolute)
   End Sub
 
   Private Sub btnAnwendung3_Click(sender As System.Object, e As _
     System.Windows.RoutedEventArgs)
      Me.MainFrame.Source = New Uri("Page3.xaml", UriKind.RelativeOrAbsolute)
   End Sub
 
   Private Sub btnAnwendung4_Click(sender As System.Object, e As _
     System.Windows.RoutedEventArgs)
      Me.MainFrame.Source = New Uri("Page4.xaml", UriKind.RelativeOrAbsolute)
   End Sub
End Class

Gru?
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Snoopy sagt - vb@rchiv find ich gut...
Schon gesehen? OSMMapViewer V2 Control