Why can't I call a protected method from an inheriting class in another package in Java?

Say there's the following base class:

package bg.svetlin.ui.controls;

public abstract class Control {
    protected int getHeight() {
        //..
    }
    //...
}

Also, in the same package, there's a class that inherits:

package bg.svetlin.ui.controls;

public abstract class LayoutControl extends Control {
    public abstract void addControl(Control control);
    //...
}

Then, there's a third class in another package:

package bg.svetlin.ui.controls.screen;

public abstract class Screen extends LayoutControl {
    //...
}

And, finally, there's the implementation class, again in a different package:

package bg.svetlin.ui.controls.screen.list;    

public class List extends Screen {

    private final Vector controls = new Vector();

    public void addControl(Control control) {
        height += control.getHeight();
        controls.addElement(control);
    }
}

Even though List inherits from Control, and the getHeight() is protected, there's the following error:

getHeight() has protected access in bg.svetlin.ui.controls.Control

I've checked that my imports are right. I'm using NetBeans.

Any idea what's wrong? I thought protected fields and methods are visible to the children even if the latter are in a different package.

Thanks!