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var wpfwindow = new WPFWindow.MainWindow();
ElementHost.EnableModelessKeyboardInterop(wpfwindow);
wpfwindow.Show();					

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public static void EnsureApplicationResources()
{
    if (Application.Current == null)
    {
        // create the Application object
        new Application();

        // merge in your application resources
        Application.Current.Resources.MergedDictionaries.Add(
            Application.LoadComponent(
                new Uri("MyLibrary;component/Resources/MyResourceDictionary.xaml",
                UriKind.Relative)) as ResourceDictionary);
    }
}					

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Visibility="{Binding DisplayDetails, Converter={StaticResource BoolToVisibilityInvertedConverter}}"					

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[...]
xmlns:converter="clr-namespace:ValueConverters;assembly=ValueConverters"
[...]
<converter:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter" />					

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public class BoolToVisibilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return (bool)value ? Visibility.Visible : Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }