private void AddAfter(TreeNode treeNode)
{
var index = children.IndexOf(treeNode);
if (-1 == index && 0 != children.Count)
index = 0;
children.Insert(index + 1, new TreeNode(AddBefore, AddAfter));
}
private void AddBefore(TreeNode treeNode)
{
var index = children.IndexOf(treeNode);
if (-1 == index)
index = 0;
children.Insert(index, new TreeNode(AddBefore, AddAfter));
}
private void AddBeforeCallback(TreeNode treeNode)
{
var index = items.IndexOf(treeNode);
if (-1 == index)
index = 0;
items.Insert(index, new TreeNode(AddBeforeCallback, AddAfterCallback));
}