/// <summary>
/// Updates the items, calling <see cref="CreateDescriptor(T)"/>
/// for each <see cref="IsValid"/> item in <paramref name="sourceItems"/>.
/// </summary>
protected virtual void UpdateProperties(IEnumerable <T> sourceItems, ICollection <IPropertyItemDescriptor <T> > targetList)
{
eventfilter.Cancel();
targetList.Clear();
foreach (T o in sourceItems)
{
if (IsValid(o))
{
targetList.Add(CreateDescriptor(o));
}
}
}
