Bug 279452 [Compatibility] Parameterized command mechanism support
Parameterized commands like showView need to be able to access their parameters (like the view ID) PW
bundles/org.eclipse.e4.ui.model.workbench/src/org/eclipse/e4/ui/model/internal/application/MHandledItemImpl.java
public MCommand getCommand() {
		if (command != null && command.eIsProxy()) {
			InternalEObject oldCommand = (InternalEObject)command;
			command = (MCommand)eResolveProxy(oldCommand);
			if (command != oldCommand) {
				if (eNotificationRequired())
					eNotify(new ENotificationImpl(this, Notification.RESOLVE, ApplicationPackage.MHANDLED_ITEM__COMMAND, oldCommand, command));
			}
		}
		return command;
	}
	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public MCommand basicGetCommand() {
		return command;
	}
	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void setCommand(MCommand newCommand) {
		MCommand oldCommand = command;
		command = newCommand;
		if (eNotificationRequired())
			eNotify(new ENotificationImpl(this, Notification.SET, ApplicationPackage.MHANDLED_ITEM__COMMAND, oldCommand, command));
	}