addTreeView();
NodeUtil.hideNode(treeViewHBox);
NodeUtil.hideNode(reloadButton);
available = false;
NodeUtil.hideNode(vboxAvailable);
<BUG>comboChoice.setOnMousePressed(new EventHandler<MouseEvent>(){
</BUG>
@Override
public void handle(MouseEvent event) {
comboChoice.requestFocus();

addTreeView();
NodeUtil.hideNode(treeViewHBox);
NodeUtil.hideNode(reloadButton);
available = false;
NodeUtil.hideNode(vboxAvailable);
comboChoice.setOnMousePressed(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
comboChoice.requestFocus();
