String value = record.getAsString(field);
if (value != null && !"".equals(value)) {
Menu contextMenu = new DeleteContextMenu(
"Unset value (i.e. set to 'Unknown')", "images/unknown_check.gif",
record, colIndex, ValueType.Boolean);
contextMenu.showAt(e.getXY()[0] + 5, e.getXY()[1] + 5);
}
}
}
}