What am i missing to keep the last option selected when submitting a form? After submit, the selected value does not stay populated

Select::create(array(
                                "name"=>"plant_region",
                                "dataStore"=>$report->dataStore("PlantRegions"),
                                "defaultOption"=>array("--"=>""),
                                "dataBind"=>"plant_region",
                                "attributes"=>array(
                                    "class"=>"form-control",
                                ),
                                "clientEvents"=>array(
                                    "change"=>"function(){
                                    console.log($(this).val());
                                    }",
                                )
                            ));