radiobuttongroup
RadioButtonGroup Class
- 
Manages the interaction between any number of Button derived classes
 - 
Provides the abstract method onSelect for executing code when a Radio Button is selected by the user.
 
Sample Usage:
/** Parameters:
  * Screen screen,
  * String UID,
  * Form form
  */
RadioButtonGroup rbg = new RadioButtonGroup(screen, "rbg") {
	@Override
	public void onSelect(int index, Button value) {
		System.out.println((String)value);
	}
};
/** Parameters:
  * Vector2f position
  * String caption
  * Object value
  */
rbg.addButton(new ButtonAdapter(screen, new Vector2f(10,10));
rbg.addButton(new CheckBox(screen, new Vector2f(10,30));
rbg.addButton(new RadioButton(screen, new Vector2f(10,50));
rbg.setDisplayElement(null); // null adds the button list to the screen layer