javafx stagestyle UNDECORATED - javafx

Question

I'm using a translator.
enter image description here
Windows desktop appears unexpectedly when you click on the image.
Scrollpane -> BorderPane
Normal at first Occurs like an image later
FXMLLoader loader = new FXMLLoader(getClass().getResource("/View/Main_fx.fxml"));
Parent root = loader.load();
st = new Stage();
final UndecoratorScene undecorator = new UndecoratorScene(st, (Region) root);//NewMainScene lib 사용(프로젝트 및 패키지 명 :Newtable)
undecorator.getStylesheets().add(getClass().getResource("/View/winDec.css").toExternalForm());
st.setScene(undecorator);
stage = (Stage) lb.getScene().getWindow();
st.getIcons().add(new Image(config2.class.getResourceAsStream("/View/207411.jpg" )));
st.initStyle(StageStyle.TRANSPARENT); //스타일 미적용.
st.setResizable(resize);
st.setMaximized(maximized);
st.setTitle(judul);
st.sizeToScene();
// Undecorator undecor = undecorator.getUndecorator();
//최소로 줄이수 있는 화면 크기 값 .
st.setMinWidth(350);
st.setMinHeight(200);
GetStage gs = new GetStage();//트레이 창으로 보낼때 현재 Stage 값 전달.
gs.SetStage(st);
st.toFront();
st.show();
Rectangle2D primScreenBounds = Screen.getPrimary().getVisualBounds();
st.setX((primScreenBounds.getWidth() - st.getWidth()) / 2);
st.setY((primScreenBounds.getHeight() - st.getHeight()) / 2);
createTrayIcon(st);//트레이 창 이벤트 메소드
firstTime = true;
Platform.setImplicitExit(false);
stage.close();//controllSplash stage 종료
Hander_Main controller = (Hander_Main)loader.getController();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:00");
Date sys_date = new Date();
String now= formatter.format(sys_date);
controller.setPrimaryStage(st);
controller.setScene(undecorator);
controller.setFirstDate(now);
st.setOnCloseRequest(new EventHandler<WindowEvent>() {
public void handle(WindowEvent we)
{
hide(st);
}
});
} catch (Exception e) {
st.hide();
dialog(Alert.AlertType.ERROR,"Main_fx Stage ERR\n"+e);
System.exit(0);
}