private void HandleChildrenChanged(object?sender, CollectionPropertyChangedEventArgs e) => OnChildrenChanged(e);
/// <summary>
/// Called when there is a change to either the collection's composition or a property value of one of this view model's children.
/// </summary>
/// <param name="e">The <see cref="CollectionPropertyChangedEventArgs"/> instance containing the event data.</param>
protected virtual void OnChildrenChanged(CollectionPropertyChangedEventArgs e)
{
}
