How can I from one panel access elements on another panel ?

I have a JFrame with 2 panels and a JMenu
I am struggling to find a way how I can access JMenu from one of my panels ...
Also how can I access elements on one panel from other panel ? At the moment I am passing a reference from one panel to other in the constructor but it's only one way communication now ... I can't go from second panel to first ...
I am sure there must be an elegant way to solve this problem.
Many thanks.
Sergei

OK I'll give you more details...
I have a JFrame with multiple panels...
Also I have a JMenu on JFrame...
Now when user clicks a button on one of the panels I need to disable a menu item ... this is issue#1
issue#2 is:
how do I get two panels (they are separate classes) talking to each other ??? At the moment when I initialize a panel#2 from my Frame I pass to it reference to panel#1 and in this way panel#2 can talk to panel#1 but panel#1 can't talk to panel#2 ...
I know there must be an elegant way to solve this problem... and I don't like having 2 classes tightly coupled like this... Can I use some kind of nice OO trick for this ? I was reading about custom listeners but I don't want to go crazy on this as I don't have time... actualy I've got only 1 day to solve this issue so any help will be greatly appreciated.
Many thanks
Sergei

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