ntwain/samples/Sample.WPF/Launcher.xaml

<Window x:Class="Sample.WPF.Launcher"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:twain="clr-namespace:NTwain;assembly=NTwain"
        Title="Scan Launcher" Height="200" Width="250"
        ResizeMode="NoResize" Style="{StaticResource AppWindow}">
    <Grid>
        <StackPanel VerticalAlignment="Center">
            <CheckBox DataContext="{x:Static twain:PlatformInfo.Current}"
                      IsChecked="{Binding PreferNewDSM}"
                      IsEnabled="{Binding IsWindows, Mode=OneWay}"
                      Content="Prefer new DSM"
                      HorizontalAlignment="Center"></CheckBox>
            <Button Content="Open scan window" Click="Button_Click" Margin="4 0"></Button>
            <TextBlock Text="This is to test opening/closing multiple twain sessions in an app" Margin="8"
                       TextWrapping="Wrap"></TextBlock>
        </StackPanel>
    </Grid>
</Window>