[TYPO3-RTE] Using external CSS file for table cells

[Ionut Cotinghi]

Hi everybody.
I use typo3 4.0. and htmlRTE 1.3.7.

I try to use a file for styles in RTE and I failed. :)
For image or link work fine but in the class selector in cell properties I
have only free class (.button).
I have of course some classe for table in that .css file.
There is some specific configuration for table cells?
Please tell me if is.

Thanks
Ionut Cotinghi
Romania