How to access GUI elements in a dynamic user interface - button

Question

I am trying to develop a dynamic user interface. When the user clicks at a certain indicator a graph of it is instantiated together with some manipulation buttons. See the image for an example. The graph is created in an HBox, together with the buttons and next added to a VBox. The problem I cannot solve is: when a button is clicked, how can I access the corresponding element?
The problem simply boils down to this:
Button buttonRemove = new Button ();
buttonRemove.setMinWidth (80);
buttonRemove.setText ("Remove");
buttonMap.getProperties ().put ("--IndicatorRemoveButton", indicator.getName ());
buttonRemove.setOnAction (e -> buttonRemoveClick ());
private Object buttonRemoveClick ()
{
// Which button clicked me??
return null;
} /*** buttonRemoveClick ***/
Any help will be greatly appreciated. I'm kind of stuck with this.
.

Answer 1

It's possible to pass a parameter to the buttonRemoveClick method in the lambda, as long as it's effectively final or a parameter.
private void buttonRemoveClick (HBox group) {...}
buttonRemove.setOnAction (e -> buttonRemoveClick (theGroup));
In this case you could also pass the ActionEvent and get the source to retrieve the Button; this may not be enough to remove the element, but for this you could traverse to the parent until you reach a child of the HBox
private void buttonRemoveClick (ActionEvent event) {
Node currentNode = (Node) event.getSource(); // this is the button
// traverse to HBox of container
Node p;
while ((p = currentNode.getParent()) != containerVBox) {
currentNode = p;
}
// remove part including the Button from container
containerVBox.getChildren().remove(currentNode);
}
buttonRemove.setOnAction (this::buttonRemoveClick);