public override Object ConvertBack(Object value, Type targetType, Object parameter, CultureInfo culture)
{
if (value != null && value is T t)
{
if (True.Equals(t))
{
return(true);
}
if (False.Equals(t))
{
return(false);
}
if (Null.Equals(t))
{
return(null);
}
}
return(DependencyProperty.UnsetValue);
}