message: add indicator that Analyze Model page isn't yet implemented
diff: <Grid Margin="20">
  <TextBlock Style="{DynamicResource SubheaderTextBlockStyle}">Analyze Model</TextBlock>
  +
  + <Border Background="Red"
  + Grid.Column="1" CornerRadius="3" Padding="4,0,4,1"
  + HorizontalAlignment="Center"
  + VerticalAlignment="Center">
  + <TextBlock Foreground="White" FontSize="36" FontWeight="Bold">SOON</TextBlock>
  + </Border>
  </Grid>
  </Page>
  