private void itemAjoutPieceActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_itemAjoutPieceActionPerformed
        // TODO add your handling code here:
        unArticle = JDialogPieces.openForm(this, lesPieces);
        if (unArticle != null) {
            article.add(unArticle);
            afficherArticle();
            calculTva();
        }
    }//GEN-LAST:event_itemAjoutPieceActionPerformed