import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;

public class MyComposite extends Composite {
    MyComposite(Composite parent) {
        super(parent, SWT.NONE);
        addComponents();
    }

    private void addComponents() {
        setLayout(new FillLayout(SWT.HORIZONTAL));
        new Button(this, SWT.ARROW | SWT.UP);
        new Button(this, SWT.ARROW | SWT.DOWN);
        new Button(this, SWT.ARROW | SWT.LEFT);
        new Button(this, SWT.ARROW | SWT.RIGHT);
    }
}