I had a lot of troubles with this, too.
IMHO the problem exists regardless of the layer type (it can be vector, wms,
wfs,... whatsoever).
As I remember the point is to use baselayer.clone() instead of baselayer and
the scale of overview should be carefully set in the options (ovOptions in
my example code). It is also possible to incorporate more than one layer in
overview, but the first one need to be a baselayer.
This is a piece of my code that works!
var ovOptions = {
maxExtent: new OpenLayers.Bounds(7380500,
4670500, 7670500, 4960500),
units: 'm',
projection: new
OpenLayers.Projection("EPSG:31277"),
scales: [1700000]
};
var overview = new OpenLayers.Control.OverviewMap({layers:
[baselayer.clone(), layer_ovode, layer_ogradovi], mapOptions: ovOptions});
map.addControl(overview);
--
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