opacity in createView Android Nexus 7

map = Ti.UI.createView({
                    width : mapDisplay.imageWidth,
                    height : mapDisplay.imageHeight,
                    backgroundImage :mapDisplay.backgroundImage,
                    zIndex : 9900,
                    opacity : 0.90 /* testing code so we can see the path layer underneath*/ 
                    //layout :'horizontal'
          });

This works on iPhone devices and also an old HTC device but on Nexus 7 it fails

any ideas ???

Thanks Roger