public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var isInverse = this.IsInverse(parameter);
if (value == null)
{
return(isInverse ? Visibility.Visible : Visibility.Collapsed);
}
var b = (bool)value;
return(VisibilityHelper.FromValue(b, isInverse));
}