CheckCombo.java

package test;

import java.awt.BorderLayout;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;

import org.pushingpixels.substance.api.SubstanceLookAndFeel;
import org.pushingpixels.substance.api.skin.GeminiSkin;

import com.jgoodies.forms.builder.DefaultFormBuilder;
import com.jgoodies.forms.layout.FormLayout;

public class CheckCombo extends JFrame {
	public CheckCombo() {
		super("Alignment");

		this.setLayout(new BorderLayout());

		JComboBox combo = new JComboBox(new Object[] { "test" });
		combo.putClientProperty(SubstanceLookAndFeel.COMBO_BOX_POPUP_FLYOUT_ORIENTATION, SwingConstants.CENTER);

		JPanel content = new JPanel();

		FormLayout lm = new FormLayout("pref", "");
		DefaultFormBuilder builder = new DefaultFormBuilder(lm, content);
		builder.setDefaultDialogBorder();

		builder.append(combo);

		this.add(content, BorderLayout.CENTER);

		this.setSize(450, 125);
		this.setLocationRelativeTo(null);
		this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
	}

	public static void main(String[] args) {
		SwingUtilities.invokeLater(new Runnable() {
			@Override
			public void run() {
				SubstanceLookAndFeel.setSkin(new GeminiSkin());
				new CheckCombo().setVisible(true);
			}
		});
	}

}