<gmaps id="gmapsEdit" width="100%" vflex="1"
    lat="@load(vm2.centerLatitude)" lng="@load(vm2.centerLongtitude)" >
    <gpolygon points="@load(vm2.geoPoints)"></gpolygon>
</gmaps>

public class SelectGisVM {
    String geoPoints = "";
    public String getGeoPoints() {
        return geoPoints;
    }
    public void setGeoPoints(String geoPoints) {
        this.geoPoints = geoPoints;
    }
}