displaying an acts_as_tree tree?

The question is this, how do i display the acts_as_tree tree i have
created? I have this:

<% puts TreeItem.root.children.find(:all)%>

also i tried: (using the display_children method from the agile book.

<% display_children(root).each do |child| %>
       <ul><li><%= child.name %></li></ul>
<% end %>

the method:

  def display_children(parent)
    puts parent.children.map { |child| child.name }.join(", ")
  end

what am i doing wrong?

What have these options generated for you? It's hard to know what's
wrong unless you tell us what you're getting (or not getting).

-Kyle