/// <summary>
/// Adds a new child node.
/// </summary>
/// <param name="child">The child tree to add.</param>
/// <returns>The complete tree.</returns>
public SortedTree <T> Add(SortedTree <T> child)
{
_children.Add(child);
child.Parent = this;
return(child);
}
/// <summary>
/// Adds a new child node.
/// </summary>
/// <param name="child">The child data.</param>
/// <returns>The new child as tree.</returns>
public SortedTree <T> Add(T child)
{
var node = new SortedTree <T>(child);
return(Add(node));
}