I have to color Calc rows, based on some string condition. So each time some string value appear in B column, the entire column is colored in certain color. It looks like on this image.

I need more strings and more conditions. How can I overcome this limitation?
Use Libreoffice 3.5 which no longer has this limitation.
For older Libreoffice version there should be an extension providing the same functionailty. Check in the Libreoffice extension repository if you can find it.