JTree - How to Expand all Nodes in the Tree

I have a tree that has one primary node, two sub-nodes, and multiple sub-sub-nodes under those. I want to expand (show) all these nodes in the tree when the tree first loads. I tried expandRow() but that only seems to expand one row at a time by entering a single integer for the row. Is there any way to expand all rows/nodes when loading the tree?

see
http://forum.java.sun.com/thread.jsp?forum=57&thread=148793

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