code: private void cmbJavaTypeActionPerformed (java.awt.event.ActionEvent evt)//GEN-FIRST:event_cmbJavaTypeActionPerformed
    {//GEN-HEADEREND:event_cmbJavaTypeActionPerformed
      // Add your handling code here:
      aColumn.setJavaFieldType(cmbJavaType.getSelectedItem().toString());
      if (cmbJavaType.getModel() instanceof org.apache.ojb.tools.swing.SortingComboBoxModel)
      {
        org.apache.ojb.tools.swing.SortingComboBoxModel cmbModel = 
          (org.apache.ojb.tools.swing.SortingComboBoxModel)this.cmbJavaType.getModel();
        if (cmbModel.getIndexOf(cmbJavaType.getSelectedItem()) == -1 )
          cmbJavaType.addItem(cmbJavaType.getSelectedItem());
      }
      else if (cmbJavaType.getModel() instanceof javax.swing.DefaultComboBoxModel)
      {
        javax.swing.DefaultComboBoxModel cmbModel = 
          (javax.swing.DefaultComboBoxModel)this.cmbJavaType.getModel();
        if (cmbModel.getIndexOf(cmbJavaType.getSelectedItem()) == -1 )
          cmbJavaType.addItem(cmbJavaType.getSelectedItem());      
      }
    }
docs: GEN-LAST:event_tfJavaFieldNameActionPerformed