private void jb_new_columnActionPerformed(java.awt.event.ActionEvent evt)//GEN-FIRST:event_jb_new_columnActionPerformed
    {//GEN-HEADEREND:event_jb_new_columnActionPerformed
        NewColumn nc = new NewColumn(parent_my, true);
        nc.setLocation(get_center(nc.getWidth(), nc.getHeight(), false));
        nc.setVisible(true);

        if (nc.isOk())
        {
            columns.add(nc.getColumn());
            jl_model.addElement(nc.getColumn());
        }
        nc.dispose();
    }//GEN-LAST:event_jb_new_columnActionPerformed