Stage loginDialog = new LoginDialog(stage);
 loginDialog.sizeToScene();
 loginDialog.showAndWait();

/* do the login */
close();
/* need to return thew user id to the main form*/

public class DialogBox {
private static String[] login;

public static String[] display(String title, String message) {
    Stage window = new Stage();
    window.initModality(Modality.APPLICATION_MODAL);
    window.setTitle(title);
    window.setWidth(300);
    window.setHeight(175);
    window.initStyle(StageStyle.UTILITY);
    Label label = new Label(message);

    //Set up the JavaFX button controls and listeners and the text fields for the login info.  The button listeners set the login values

    window.setScene(new Scene(root, 300, 175);
    window.showAndWait();
    return login;
 }

String[] login = DialogBox.display("Login Dialog", "Enter User Name and Password");