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Focus problem...

Hi,
I want to dynamically change the application menu depending on which
panel is seleted inside a split pane.

My application, has following things :
1) main frame - a JFrame derived class,
2) a single JSplitPane inside the main frame
3) Two panels (horizontally separated) inside the split pane -left panel
and right panel.
4) any number of children (at any depth) in these two panels.
What I want to do is, when the user clicks anywhere inside the left
panel, I want to change the main frame's menu bar items (or sub menus).
Also, when the user clicks anywhere inside the right panel, I want to
change the menu accordingly.
Thus, I want to know when the panel as a whole 'gets focus' (I cannot
use the term 'gets activated' because, I suppose it is used in context
of Frames and internal frames), though actually a child deep inside the
panel has got the actual focus.
I tried registering a FocusListener with both the panels, but it doesn't
work even when I click on the panel itself - and not on any of it's
children.
I tried registering a mouse listener with both the panels, but
(obviously) that too doesn't work because, the mouse 'press' or 'click'
is generated on the actual (possibly a child) component instead of the
panel itself.

Is there an easy way to accomplish something like he wanted? I mean a
way of detecting of one of the child components of a certain JPanel gets
the focus?
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