/// <summary>Add the node to the children list at the given insertion point.</summary>
/// <remarks>
/// Add the node to the children list at the given insertion point.
/// The basic add method which actually calls children.add(..).
/// </remarks>
private void AddChild(INode node, int insertionPoint)
{
if (children == null)
{
children = new AList <INode>(DefaultFilesPerDirectory);
}
node.SetParent(this);
children.Add(-insertionPoint - 1, node);
if (node.GetGroupName() == null)
{
node.SetGroup(GetGroupName());
}
}