ID

I want to make UI Events but Eclipse underlines something in red:

Button button = (Button)findViewById(R.id.corky);

He underline "R.id".

I have a button whit the name "Ok"
what am I doing wrong?

My full class:

package stijn.test; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class Test extends Activity implements OnClickListener { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button button = (Button)findViewById(R.id.corky); button.setOnClickListener(this); } public void onClick(View v) { // do something when the button is clicked } }