GridPane controls = new GridPane();
controls.setVgap(5);
controls.setHgap(5);
controls.getChildren().addAll(brightnessLabel, brightnessSlider, brightnessField, saturationLabel, saturationSlider, saturationField, webLabel, webField);
controls.setManaged(false);
controls.resizeRelocate(
PICKER_PADDING + 10,
PICKER_PADDING + ARROW_SIZE + 10 + 170 + 10,
PICKER_WIDTH - 20,
controls.getPrefHeight());