how can i had to class layout in R another xml file ? it should b autmatic as i had new resources to res but it's not someone knows what i did wrong ?

i open an activity and now i want to open another activity that will work with another xml example i have menu and main.xml now i want to go for anther activity called gamescreen using this method :

newGameButton.setOnClickListener(new OnClickListener() {

            public void onClick(View view) {
                Intent i = = new Intent(this, gameScreen.class);
                startActivity(i);
            }

}

i want to move to another "page" to another activity called gameScreen which should b associated to the xml called gameScreen.xml

but in his onCreate :

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gameScreen);

}

and gameScreen is not a member of the R file

please help me i am sitting for the last 4 hours felling like an idiot ...