Spreadsheet - How to define Conditional Formatting?

Hi,

I have following problem using Vaadin Spreadsheet:
I would like to set up a conditional formatting in some cells of a row to show a red background if the values in the cells are greater than a specific value.

I already tried it with the definitions described in this example, but no success:
http://thinktibits.blogspot.de/2012/12/Java-POI-XLSX-Conditional-Formatting-Example-Program.html

Unfortunately I could not find any proper example using the
Vaadin Spreadsheet ConditionalFormatter class
.

It would be great, if someone could help me.
Thanks in advance.

Gerhard