// This example is from the book _Java AWT Reference_ by John Zukowski.
// Written by John Zukowski.  Copyright (c) 1997 O'Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or
import java.awt.*;
public class ComponentUtilities {
    public static Frame getTopLevelParent (Component component) {
        Component c = component;
        while (c.getParent() != null)
            c = c.getParent();
        if (c instanceof Frame)
            return (Frame)c;
        else
            return null;
    }
}