Using TestNG, is there a way to ignore @before class when calling one class into another?

I have two test classes each containing a number of tests. I'd like to run both of these together without having to have the @BeforeClass setup method being ran both times. I am calling the classes like this:

    public static void main(String[] args) {
        TestListenerAdapter tla = new TestListenerAdapter();
        TestNG testng = new TestNG();
        testng.setTestClasses(new Class[] { TestClass1.class, TestClass2.class });
        testng.addListener(tla);
        testng.run();
    }

The reason for this is because I have both of them calling in a pop up menu and only want to select the option one time. If this is unclear I will try to further explain.