What event is called when the handle next to a tree node is clicked

Hi,
I have a JTree...and the nodes in the tree have a little handle next to them. When i click on the handle, the children of that node, are shown below (as expected). However, what event occurs before the treeExpanded event is fired?? it seems like something happens just before it.
thanks

Post your code, I dont think any event except treeExpanded is fired.

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