Using MarkerManager with GPolygon and LabeledMarker (overlay disappearing)

Hello everyone,

First of, thanks for reading and sorry if there is tooo much or to
little information here.

I am using the following utilities in my maps app (ASP.NET 3.5)
* http://gmaps-utility-library-dev.googlecode.com/svn/tags/labeledmarker/
* http://gmaps-utility-library-dev.googlecode.com/svn/tags/markermanager/

Since MarkerManager does not support polygons, I have, after
searching, used the following code to make it work with polygons.

GPolygon.prototype.getPoint = function() {
if (!this.Centre) this.Centre = this.getBounds().getCenter();
return this.Centre;
};

Polygon type: UK postcode boundary, around 25 at a time with an
average of 100 points plus a LabeledMarker for each of them.

Leaving aside the inaccuracy based on using polygon's center point, I
have a couple of problems.

1. MarkerManager Problem: Polygons disappearing when using the map's
zoom controls -

Description - After a user action the polygons are plotted
successfully. If the user either zooms in or zooms out one step then
most of the time the polygons disappear. the LabeledMarker stay.

Observations:
>Does not happen all the time
>If the user zooms in or out another level the polygons reappear. They seem to disappear/appear with each zoom step.
>If they are currently disappeared and the user pans the map away from them and then pans back from a sufficient distance, they reappear and work properly
>I show a small infowindow on polygon click. it still works when the polygons are invisible. I.e they behave as if they where there

2 LabeledMarker Problem: The markers seem to duplicate sometimes when
zooming in/out and stay fixed in the map window. i.e not moving when
we zoom in/out but they move with the map if we pan it. The copies are
not clickable but the one that is at the original position keeps
working ok.

I think :
>Using firebug I have tried to step thru the execution. it Appears that marker manager removes all markers(inc polygons,LabeledMarkers) when zoom is changed and then adds them again. The adding part seems to fall right when the map is performing the zoom operation and seems to mess up displaying of the polys/labels

I dont have a live version running at present and am unable to show
the site to you. But I think the problem lies with using GPolygon and
LabeledMarker with MarkerManager

Thank you for you time. Please help if you can.

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