How to change programatically height of Anchor Pane on demand?

Question

I have vertical SplitPane and want to change size of inner AnchorPane s programatically by clicking on the button. So far, I have

@FXML
private void handleToggleBottomAction(ActionEvent event) {
    event.getEventType().getName();
    if(bottomToggledUp){
        bottomToggledUp = false;
        //hide bottom pane

        apBottomPane.setPrefHeight(15);
        apMapPane.setPrefHeight(750);
        apBottomPane.requestLayout();
    } else {
        // view bottom pane
        bottomToggledUp=true;
        apBottomPane.setPrefHeight(100);
        apMapPane.setPrefHeight(650);
        apBottomPane.requestLayout();
    }
}

But this doesn't change them? How to solve this?

Answer 1

use AnchorPane.setMinSize(double,double);

now they will be force to comply