Keeping a DHTML tree expanded in Oracle APEX

I have created a list item to be used as the primary navigation within my APEX application.

The tree can be expanded and clicking on a leaf node takes you to the correct page. However, on arrival at the new page, the tree is back a开发者_运维问答t its starting position, completely collapsed. How do I keep the tree expanded?

I am using Apex 3.2.1, the region has been created on page zero. Within the region definition, under the source heading, the value for "List Template Override" is DHTML tree.

I don't think the DHMTL tree in Apex gives you this option. You can probably achieve it using javascript, although a javascript library solution may be easier - e.g. ExtJS navigation tree.