Tree Component Help

hi everybody,
today i was going through the new updated help of mx2004 and in the tree class help i just couldnt digest one thing it was given as

Tree.setIcon() ------ Specifies whether a node is open or
closed.

Tree.setIsOpen() ------ Specifies a symbol to be used as an icon
for a node.

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can anybody help me with the tree component

I need to open the tree node but clicking on the name but the node opens on clicking the arrow icon beside it :hr: