if(articleList.getSelectedValue() != null) {
// GuiUtils.showError("show article popup");
//TODO select value under mouse
ArticlePopupMenu popup = new ArticlePopupMenu();
popup.setLocation(e.getPoint());
popup.show((Component) e.getSource(), e.getX(), e.getY());
}
// else {
// GuiUtils.showError("no selection!");
// }
}