This is a older document i wrote last winter. I reposted it here just incase people were looking for it still. I will also post the update with the yahoo yui tree menu very soon.

Expandable Tree Menu for MODx

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Well i just started playing with modx a week ago or so and plan on
using it for my personal Web Development/Freelance Site.  Ive always
liked a tree menu for my site nav menu and figured that it would be
easy to add to modx with just a minor change to the wayfinder php file.
Anyway i used the Dynamic Drive simple tree menu to do this.

– http://www.dynamicdrive.com/dynamicindex1/navigate1.htm

Visit
the above link and download the Javascript file, the css file and the 3
images. Include the java and css file as you would in the example they
give you, then do the following to display the menu.

Using
this menu system requires a ID to be added to the root UL which i
discovered wayfinder could not do so i modifyed wayfinder to do this. 
Please note i used wayfinder 1.0

Step #1

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-> Open Manager->Resources->Snippets->Wayfinder

Add this line under the other lines that look like it

Step #2

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-> In your text editor open the wayfinder.php file ( located in assets/snippets/wayfinder/wayfinder.inc.php )

Search for this line ( around line # 189 )

Now directly under it add

Step #3

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Now your call to Wayfinder will look like this

And there you have it a working tree menu.

You can see a sample on my unfinished site at www.earthbeans.org