Plotting lots of points in Virtual Earth

Trying to plot a KML file containing 2500 cities on an embedded
Virtual Earth map. The VE api has a property to increase maximum
number of items to plot from the default 200. It looks like this:

veLayerSpec.MaxImportedShapes = 3500;

Problem is, it doesn't work. Seems to be ignoring the
MaxImportedShapes property. Here is a link to my web page:

http://college.holycross.edu/faculty/rlent/cities.html

Does anyone know if this is a bug, or am I just missing something
obvious?

Thanks,

Rich Lent