Problema com GridBagLayou e JScollPane

Programação Java
#1

pessoal o meu problema com gridbaglayout é pq o panel que contem os check box fica sempre centralizado.
preciso que ele fique sempre NORTHWEST. canto superior direito.


package br.com.topsoft.topBI.Interface;

import br.com.topsoft.topBI.Entidade.Relatorio;
import br.com.topsoft.topBI.Entidade.Tabela;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.util.List;
import javax.swing.BorderFactory;
import javax.swing.JCheckBox;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.border.TitledBorder;

/**
 *
 * @author Thiago
 */
public class FormAdicionaRestricao extends JDialog {

    private Relatorio relatorio;
    private JPanel panelprincipal;

    public FormAdicionaRestricao(Relatorio relatorio) {
        super();

        this.relatorio = relatorio;

        this.panelprincipal = new JPanel(new GridBagLayout());

        this.setSize(this.getToolkit().getScreenSize());
        JScrollPane s = new JScrollPane();
        s.setViewportView(this.panelprincipal);

        this.getContentPane().add(s);

        this.setModal(true);
        addPanelsTabela(this.relatorio.getTabelas());
        
        
        this.setVisible(true);

    }

    private void addPanelsTabela(List<Tabela> tabelas) {
        for (Tabela tabela : tabelas) {
            JPanel panel = getPanel(tabela.getDescricao());
            panel.setName(tabela.getDescricao());
            GridBagConstraints grid = null;

            for (int i = 1; i <= tabela.getColunas().size(); i++) {

                if ((i % 6 == 0) || (i == 1)) {
                    grid = new GridBagConstraints();
                    grid.insets = new Insets(4, 4, 4, 4);
                    grid.anchor = GridBagConstraints.NORTHWEST;
                    grid.weightx = 1;
                    grid.gridwidth = 1;
                }

                JCheckBox check = new JCheckBox(tabela.getColunas().get(i - 1).getDescricao());
                check.setSize(check.getPreferredSize());

                if ((i % 6 == 0) && (i > 0)) {
                    grid.gridwidth = GridBagConstraints.REMAINDER;
                    panel.add(check, grid);
                } else {
                    grid.gridwidth = 1;
                    panel.add(check, grid);
                }
            }

            GridBagConstraints grids = new GridBagConstraints();

            grids.anchor = GridBagConstraints.NORTH;
            
            grids.gridwidth = GridBagConstraints.REMAINDER;
            grids.fill = GridBagConstraints.BOTH;
            grids.weightx = 1;
            grids.insets = new Insets(4, 4, 4, 4);
            this.panelprincipal.add(panel, grids);

            panel.repaint();

        }
    }

    private JPanel getPanel(String descricao) {
        JPanel panel = new JPanel(new GridBagLayout());
        panel.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createLineBorder(Color.black, 1),
                BorderFactory.createTitledBorder(BorderFactory.createEmptyBorder(), descricao,
                TitledBorder.LEFT, TitledBorder.CENTER,
                new Font("Dialog", Font.BOLD, 14), Color.BLACK)));
        panel.setVisible(true);

        return panel;
    }
}
#2