Dialog opening with Kotlin.

dialog.kt

                val alert = Alert(Alert.AlertType.CONFIRMATION)
                alert.title = "Overwriting Balance File"
                alert.contentText = "You has opened balance.bin file, you want to save current session file?"

                val okButton = ButtonType("Yes", ButtonBar.ButtonData.YES)
                val noButton = ButtonType("No", ButtonBar.ButtonData.NO)
                val cancelButton = ButtonType("Cancel", ButtonBar.ButtonData.CANCEL_CLOSE)

                alert.buttonTypes.setAll(okButton, noButton, cancelButton)

                alert.showAndWait().ifPresent { type ->
                    if (type == ButtonType.OK) {
                        // todo: Save current session file changes and show create new dialog

                        ApplicationLogger().logger.info("OK Clicked!")
                    }

                    if (type == ButtonType.NO.apply {
                                val saveDialog = FileDialog(Frame(), "Select File Directory", FileDialog.SAVE)

                                saveDialog.file = "balance.bin"
                                saveDialog.isVisible = true

                                if (saveDialog.directory != null || saveDialog.file != null) {
                                    val filePath = saveDialog.directory + saveDialog.file

                                    val initialStream = (javaClass.getResourceAsStream("etc/balance.bin"))

                                    File(filePath).outputStream().use { initialStream.copyTo(it) }

                                    filePathTextField.text = filePath
                                    fileIsOpened = true
                                }
                            })

                    if (type == ButtonType.NO) {
                        val saveDialog = FileDialog(Frame(), "Select File Directory", FileDialog.SAVE)

                        saveDialog.file = "balance.bin"
                        saveDialog.isVisible = true

                        if (saveDialog.directory != null || saveDialog.file != null) {
                            val filePath = saveDialog.directory + saveDialog.file

                            val initialStream = (javaClass.getResourceAsStream("etc/balance.bin"))

                            File(filePath).outputStream().use { initialStream.copyTo(it) }

                            filePathTextField.text = filePath
                            fileIsOpened = true
                        }
                    }
                }