Overview Map - Chrome

[ADAY2355]

The overview map does not seem to work in Chrome.  I am seeing a blue square and nothing to select.  Is this correct?

Code is below:

var osmar = new OpenLayers.Layer.OSM.Osmarender("Osmarender");
    var options = {layers: [osmar]};
    this.map.addControl(new OpenLayers.Control.OverviewMap(options));

Is there a workaround or is this a known problem?