Bug 204458 [Commands] Allow menu and toolbars to fire execution events
Keybindings will currently fire execution events when executing actions from the action framework. i.e. IActions with their actionDefinitionId set and IActionDelegates with the definitionId attribute in their action contributions. But it would be nice if selecting the menu or tool item would also fire the equivalent events. PW
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/CommandManager.java
* Returns the set of identifiers for those parameter types that are
	 * defined.
	 * 
	 * @return The set of defined command parameter type identifiers; this value
	 *         may be empty, but it is never <code>null</code>.
	 * @since 3.2
	 */
	public final Set getDefinedParameterTypeIds() {
		return Collections.unmodifiableSet(definedParameterTypeIds);
	}
	/**
	 * Returns the command parameter types that are defined.
	 * 
	 * @return The defined command parameter types; this value may be empty, but
	 *         it is never <code>null</code>.
	 * @since 3.2
	 */
	public final ParameterType[] getDefinedParameterTypes() {
		final ParameterType[] parameterTypes = new ParameterType[definedParameterTypeIds
				.size()];
		final Iterator iterator = definedParameterTypeIds.iterator();
		int i = 0;
		while (iterator.hasNext()) {
			final String parameterTypeId = (String) iterator.next();
			parameterTypes[i++] = getParameterType(parameterTypeId);
		}
		return parameterTypes;
	}
	/**
	 * Gets the help context identifier for a particular command. The command's