Bug 258833 [Commands] RadioState doesn't work
bundles/org.eclipse.jface/src/org/eclipse/jface/commands/RadioState.java
* active members. If there are, they are deactivated.
			 * 
			 * @param state
			 *            The state that should become active; must not be
			 *            <code>null</code>.
			 */
			private final void activateMember(final RadioState state) {
				if (active!=null && active != state) {
					active.setValue(Boolean.FALSE);
				}
				active = state;
			}
			/**
			 * Adds a member to this radio group. If the state being added is
			 * active, then it replaces the currently active group memeber as
			 * the active state.
			 * 
			 * @param state
			 *            The state to add; must not be <code>null</code>.
			 */
			private final void addMember(final RadioState state) {
				if (members == null) {
					members = new HashSet(5);
				}
				members.add(state);
				state.addListener(this);
				final Object value = state.getValue();
				if (value instanceof Boolean) {
					if (((Boolean) value).booleanValue()) {
						activateMember(state);