/// <summary>
/// Add a factor tree node to the children
/// of this factor tree node.
/// </summary>
/// <param name='factorTreeNode'>Factor tree node to add.</param>
public void AddChild(WebFactorTreeNode factorTreeNode)
{
if (Children.IsNull())
{
Children = new List <WebFactorTreeNode>();
}
Children.Add(factorTreeNode);
factorTreeNode.AddParent(this);
}
