Alas, I have not been able to figure out how to do these two things
with KML files:

A.  When the map first appears on the user's screen, then display a
KML file and let the API automatically set the map center and zoom
B.  As the user toggles the KML on/off, preserve the viewport

Below is Google's KML demo map to which I added
preserveViewport:true
Adding this setting is the key to doing item 'B'.

However, the initial appearance of the map (item 'A') uses the zoom
setting in the options and as a result only part of the KML data is on
the map.  When I  tried deleting the zoom setting in the options, then
I got a blank map.

http://www.mappingsupport.com/forum_post/preserveViewport_kml_10.html

I know how to toggle the KML on/off.

Any ideas for how I can get all the KML to appear on the map when it
first appears on the screen?

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