+ JPopupMenu pop = buildPopupMenu(res);
+ if (pop.getSubElements().length > 0)
+ {
+ pop.show(this, evt.getX(), evt.getY());
+ }
+ }
+
+ /**
+ * Builds a popup menu with 'Hide' or 'Reveal' options, or both, or neither
+ *
+ * @param res
+ * column number (0..)
+ * @return
+ */
+ protected JPopupMenu buildPopupMenu(final int res)
+ {