Toggle implementation for custom RadioButton - radio-button

Question

I need to create a custom RadioButton without circle. Its a very simple class that extends Label and implements Toggle.
I added a mouse clicked handler :
private class MouseClickedHandler implements EventHandler<MouseEvent> {
#Override
public void handle(MouseEvent t) {
final Toggle toggle = (Toggle) t.getSource();
if (!toggle.isSelected()) {
getToggleGroup().selectToggle(toggle);
}
}
}
My problem is to set a default selected radio button.
If on one of the RadioButton I call setSelected(true) after its creation and after adding it to a ToggleGroup, when I launch the application if I click on other radio buttons in the group, the ToggleGroup does its job of deselecting except for that default one. I always end up with 2 radio buttons selected, the one on which I called setSelected(true) directly, and the one currently selected by a click.
I corrected it - Complete code :
public class RadioBtn extends Label implements Toggle {
private ObjectProperty<ToggleGroup> toggleGroup = null;
private BooleanProperty selectedProperty = null;
public RadioBtn {
initHandlers();
}
#Override
public ToggleGroup getToggleGroup() {
return toggleGroupProperty().get();
}
#Override
public void setToggleGroup(ToggleGroup tg) {
if (getToggleGroup() == null) {
toggleGroupProperty().set(tg);
}
getToggleGroup().getToggles().add(this);
}
#Override
public ObjectProperty<ToggleGroup> toggleGroupProperty() {
if (toggleGroup == null) {
toggleGroup = new SimpleObjectProperty<>();
}
return toggleGroup;
}
#Override
public boolean isSelected() {
return selectedProperty().get();
}
#Override
public void setSelected(boolean bln) {
selectedProperty().set(bln);
}
#Override
public BooleanProperty selectedProperty() {
if (selectedProperty == null) {
selectedProperty = new SimpleBooleanProperty();
}
return selectedProperty;
}
protected void initHandlers() {
if (getToggleGroup() != null) {
setOnMouseClicked(new ToggleGroupHandler());
}
}
private class ToggleGroupHandler implements EventHandler<MouseEvent> {
#Override
public void handle(MouseEvent t) {
final Toggle toggle = (Toggle) t.getSource();
if (!toggle.isSelected()) {
/*if(getToggleGroup().getSelectedToggle() != null) {
getToggleGroup().getSelectedToggle().setSelected(false);
}*/
getToggleGroup().selectToggle(toggle);
}
}
}
}