How to create dynamics command object

I created a few classes that represent Commands to my car:

• PaintCommand.
• RefuelCommand.

This classes implemented ICommand Interface, Contain Execute(Car c) method.

Example:

    public class RefuelCommand : ICommand
{
    public RefuelCommand()
    {
    }


    public void Execute(Car car)
    {
        car.SetFuel(100);
    }
}

I used command patterns to init the commands.

Now, i want to be able to add new Command without change the code.

Assume i want now Change Name command

Does anyone have an idea?

My Idea:

Create a xml file that describe the class command. (Name, Param) and generate from it a new Command object.