JavaFX 8 Edit table cell on click of placeholder button - javafx

Question

In my TableView I'm using a button as the placeholder when there are no items available in the table. And on click of this button I want to add a new row and then make the first cell in this row editable. I was able to successfully add new row, but the making the first cell editable does not work. I have tried using Platform.runLater to start the editing, but it doesn't work either. Below is the code for what I'm trying to do. Any help would be appreciated. Thanks
public class TableEditTest extends Application {
#Override
public void start(Stage primaryStage) {
TableColumn<Person, String> colA = new TableColumn<>("Name");
colA.setCellFactory(TextFieldTableCell.forTableColumn());
colA.setCellValueFactory(new PropertyValueFactory<>("name"));
TableColumn<Person, String> colB = new TableColumn<>("Age");
colB.setCellFactory(TextFieldTableCell.forTableColumn());
colB.setCellValueFactory(new PropertyValueFactory<>("age"));
TableColumn<Person, String> colC = new TableColumn<>("Gender");
colC.setCellValueFactory(new PropertyValueFactory<>("gender"));
colC.setCellFactory(TextFieldTableCell.forTableColumn());
TableView<Person> tableView = new TableView<>();
tableView.setEditable(true);
tableView.getColumns().addAll(colA, colB, colC);
Button btn = new Button();
btn.setText("Add Item");
btn.setOnAction((ActionEvent event) -> {
tableView.getItems().add(new Person());
// Edit the first cell
Platform.runLater(() -> {
tableView.edit(0, colA);
});
});
tableView.setPlaceholder(btn);
StackPane root = new StackPane();
root.getChildren().add(tableView);
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}