Actionscript 3 :: Determine The Sequence Of Events?

I am using flex-4-tree [URL] in a mobile phone AIR app.

The Tree CLass:

public class Tree extends List
{
...
dataSource.addEventListener(TreeEvent.NODE_EXPANDED, nodeExpandedHandler);
dataSource.addEventListener(TreeEvent.NODE_COLLAPSED, nodeCollapsedHandler);
...
}

There is a menu on the main screen of the app. If the user selects a menu-item, the appropriate action is taken, but if the user expands/collapses a menu-item by selecting the expander icon, the menu-item is expanded/collapsed.

Currently the List change Event is received before the flex-4-tree Expand/Collapse Events.

I need to receive the flex-4-tree Expand/Collapse Events before the List change Event.