public void delete()
{
foreach (TTNode child in children)
{
child.delete();
}
tb.Dispose();
cb.Dispose();
linesToChildren.Clear();
if (lineToParent != null)
{
lineToParent.Dispose();
lineToParent = null;
}
if (parent != null)
{
parent.linesToChildren.Clear();
}
if (sibling != null && !siblingDeleted)
{
siblingDeleted = true;
sibling.delete();
}
}