Bug 87856 [Commands] Last closed editor leaked due to reference by command manager
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/Command.java
stringBuffer.append(',');
			stringBuffer.append(parameters);
			stringBuffer.append(')');
			string = stringBuffer.toString();
		}
		return string;
	}
	/**
	 * Makes this scheme become undefined. This has the side effect of changing
	 * the name and description to <code>null</code>. Notification is sent to
	 * all listeners.
	 */
	public final void undefine() {
		string = null;
		final boolean definedChanged = defined;
		defined = false;
		final boolean nameChanged = name != null;
		name = null;
		final boolean descriptionChanged = description != null;
		description = null;
		final boolean categoryChanged = category != null;
		category = null;
		final boolean parametersChanged = parameters != null;
		parameters = null;
		fireCommandChanged(new CommandEvent(this, categoryChanged,
				definedChanged, descriptionChanged, false, nameChanged,
				parametersChanged));
	}
}