🚀 go-pugleaf

I've learn about awt & swing since one week but i'm going to become crazy !
I'm using JBuilder 2 with JDK 1.1.6 or 1.1.8.
I put a JComboBox on my Frame, the JComboBox works fine !
I put a JComboBox on a  Panel or JPanel or a GroupBox and my JComboBox
doesn't work fine.
When i click on it, it flashes !!!
It seems to be a problem of weight but it can resolve my problem.
Evenif i modify the value of lightWeightPopupEnable, it doesn't work !
Is it impossible to put a JComboBox on panel ? i think not, i must do a
mistake but where ?
It seems to be a simple program but .....
Here come a simple code that doesn't work as i want !

PS: Great thanks for those who wants to help me !

/ * Beginning of the code*/

package sans_titre8;
import java.awt.*;
import borland.jbcl.layout.*;
import borland.jbcl.control.*;
import com.sun.java.swing.*;


public class Frame1 extends Frame{
  JPanel jPanel1 = new JPanel();
  JComboBox comboDoesntWorking = new JComboBox();
  XYLayout xYLayout1 = new XYLayout();
  JComboBox comboWorking = new JComboBox();

  void Frame ()
  { }

  public Frame1() {
    try  {
      jbInit();
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  private void jbInit() throws Exception {
    this.setLayout(xYLayout1);
    comboDoesntWorking.setEditable(true);
    comboWorking.setEditable(true);
    this.add(jPanel1, new XYConstraints(17, 15, 226, 83));
    jPanel1.add(comboDoesntWorking, null);
    this.add(comboWorking, new XYConstraints(248, 132, 112, 26));
    comboDoesntWorking.addItem("t");
    comboDoesntWorking.addItem("t");
    comboWorking.addItem("t");
    comboWorking.addItem("t");
  }

  public static void main (String args[])
  {Frame1 frame = new Frame1();
   frame.setSize(400,200);
   frame.setVisible(true);
  }

}
/* End of the code*/