GEO MAP - Selection deosn't show dimension

Hello,

I am trying to capture the selected dimension from the Geo Map component.  However, I don't get an option to pick the selected dimension when I use the following property:

TEXT_1.setText(GEO_MAP_1.getSelectedValue(dimension));

If I use the same script for the CHART component, I am able to pick a dimension.  Is this a bug of some sort?  Any help would be appreciated.