* @param selected flag indicating if the button is currently selected.
* @param group the button belongs to
* @return created RadioButton
*/
private RadioButton addRadioButton(String label, boolean selected, SelectableGroup group) {
RadioButton radio = new RadioButton(group, metic, font);
radio.setSelected(selected);
radio.setText(label);
group.add(radio);
add(radio,new MaximalGridLayoutConstraints(ECellPosition.TOP_LEFT));
return radio;
}