Thanks Jason, that works for some situations. But I have a problem;

There are some specific situations where toggling a single checkbox
needs to show/hide more than one layer (because there are a few
situations where an individual object like a muscle actually has to be
made from two layers so that a third layer can travel between them to
make it look diagramatically correct).

Any ideas how I might apply this?

It would be so great if a show() hide() feature were added. I realise
keeping the API lightweight is a major consideration in V3, but I
suspect at the level this would be implemented, any developer would be
well aware of the need to keep things light and tidy.



On Jul 21, 7:23 pm, Jason Sanford <jasonsanf...@gmail.com> wrote:
> I had a similar problem and posted about how I dealt with it 
> here:http://geojason.info/2010/05/overlay-map-management-with-google-maps-...
>
> Basically what I'm doing is inserting a null value for every overlay I plan
> on adding to the map into the map.overlayMapTypes array and then creating a
> new imageMapType when a check box is clicked.
>
> <http://geojason.info/2010/05/overlay-map-management-with-google-maps-...>Probably
> not the most elegant solution, but it seems to work.
>
>
>
> On Wed, Jul 21, 2010 at 8:47 AM, Kesuke <nick_dai...@hotmail.com> wrote:
> > Thanks for the suggestions, however I'm having two major problems with
> > this approach;
>
> > 1.) It works the first time its clicked, but I think its trying to
> > insertAt or removeAt where objects have already been removed. I'm
> > wondering if when an element is 'removeAt', everything moves down the
> > MCV array. e.g. index 3 becomes 2.
>
> > 2.) Because this involves multiple transparent layers being stacked
> > ontop of each other, it leads to unusual z-index issues where layers
> > end up in the wrong order. You can see this on the example below when
> > you click Pectoralis major twice (to hide, then again to show). It
> > will appear behind the intercostal layer.
>
> > I've setup a test to show the strange behaviour of this approach at
> >http://anatomy.study-medicine.co.uk/testg3t3.html(you can see the
> > code changes on line 298)
>
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