Keycode event for BACKSPACE in JavaFx

I am doing a project in JavaFX, using Java 8 and Gluon scenebuilder. I want to detect when backspace is pressed inside a TextField. This is the code I am using:

public void keyPressed(KeyEvent kEvent) {
    if (kEvent.getCode() == KeyCode.BACK_SPACE) {
        System.out.println("Backspace pressed");
    }

This code is inside the controller file, called FXMLDocumentController, which controls the GUI xml file FXMLDocument. You can see from the image below the function is called whenever a key is typed inside TextField. This works with all the letters/numbers, but not with backspace.

Theoretically it should work, but it doesn't.

How can I manage typing of the backspace button?

Edit:

Notice that putting this exact function on the root of the elements, on the "Window itself" (which is the AnchorPane) works. The problem is with reading the pressing of the backspace inside the TextField. You can see in the image below where I've put the function:

You should use your keyPressed method in either on key pressed or on key released.

In the Docs, it states that:

No key typed events are generated for keys that don't generate Unicode characters (e.g., action keys, modifier keys, etc.).

Backspace is consider an Action Key.