From the documentation here:
Changing the contract/expand state of a tree menu
By default when you transform a list into tree menu, all sublists are contracted until clicked on. You can set a particular sublist (and all of its parent sublists, if any) to be expanded by default by inserting the attribute:
Code:
<li>Folder 1.1
<ul rel="open">
<li>Sub Item 1.1.1</li>
<li>Sub Item 1.1.2</li>
<li>Folder 1.1.1
<ul>
<li>Sub item 1.1.1.1</li>
<li>Sub item 1.1.1.2</li>
<li>Sub item 1.1.1.3</li>
<li>Sub item 1.1.1.4</li>
</ul>
</li>
</ul>
inside the UL element you wish to be expanded automatically when the page loads.
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