hotspot tabIndex?

I need to set the tabIndex on hotspots, I was able to enable tabIndex in my plugin with:

var pluginsprite:Object = krpano.get("plugin[controlPanel].sprite");
pluginsprite.tabEnabled = true;
pluginsprite.tabChildren = true;

found here and set them on items in my plugin, how do I add the hotspots to the tabIndex? Thanks in advance.