How to validate a whole column of DataGrid

I want to validate a whole column of DataGrid using
Validator.
How to do that?

Thanks. It works! Prima!
It's a little bit difficult for me to write and understand the English terms correctly, cause I am German.
I did not recognize, that I had to go to the Library Module!
Here I repeat Rikk's way in German:
Im Bibliothek-Modul
Rasteransicht
Bilder selektieren
Im Menufeld Ad-hoc Entwicklung:
Freistellungsfaktor einstellen: 16:9

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How to highlight the whole row of a particular line item of sale

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Looking forward your reply.
Moderator message: please do more research before asking, show what you have done yourself when asking, do not flag posts as "urgent".
[Rules of engagement|http://wiki.sdn.sap.com/wiki/display/HOME/RulesofEngagement]
[Asking Good Questions in the Forums to get Good Answers|/people/rob.burbank/blog/2010/05/12/asking-good-questions-in-the-forums-to-get-good-answers]
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