Animated tab box - playReverse when click elsewhere?

Question

Hello!
I've got a bit of a tricky one I'm hoping someone could help me with!
I've designed what is basically a tabbed info window in Edge Animate to add to a website deigned in Muse.  There are 5 animated headings and when each one is clicked, the relevant info is revealed below it...
So, I've got so far:
MouseEnter:      sym.getSymbol("Heading1").play('Over');
MouseLeave:     sym.getSymbol("Heading1").playReverse();
Click:                 sym.getSymbol("Heading1").play('Click');
                         sym.getSymbol("Info1").play('Click');
And what I'd like to add is - when Heading2 (or Heading3 /4 /5) is clicked, Heading1 then playReverse to resume the initial state and the animation of Heading2 follows...
I've already tried a  sym.getSymbol("Heading1").playReverse();  But I need it to look at which symbol is currently activated and only play that one in advance.
I hope that makes sense!
Me second problem is once the heading is clicked, I'd like it to stay that way until another heading it clicked.  At the moment the MouseEnter and MouseLeave actions still work if you roll over the heading.
I'm a newbie so please keep it as simple as you can!   And any help would be greatly appreciated!
Here's my project if it helps to see:  http://we.tl/GXk9jqCupP
Thanks :-)

Answer 1

I am back with upgraded demo files and an attempt with your case.
1) Demo file "buttons and panels" using Edge API: API button panel_upgraded.zip - Box
2) Demo file "buttons and panels" using extra API: https://app.box.com/s/n6trsx2riyglutvveujf
3) Your case: Website_CDMVD_SymbolsV3 - copie.zip - Box
I began to make simpler the stage panel (one button, one panel). So i group some symbols using "convert to symbol".
I added the compositionReady panel, and panels trigger to manage change panels.
It doesn't yet run fine. I will go on.
Do you want these effects (demo files)?