This example shows how to use CesiumExt.featureInfo.ImageryLayerFeatureInfo to show the properties from the features present in one or more Imagery Layers:

The CesiumExt.featureInfo.ImageryLayerFeatureInfo request the user to pick a point to retrieve the properties of a feature.

If MORE THAN ONE feature is found, all of them will be shown in the Feature Property Grid.

Have a look at featureInfo.js to see how this is done.