[TYPO3-english] RTE block style

[Dieter Jansen]

Hi

I tried reading the documentation about the Page TSconfig. However it 
begins to dazzle me when it concerns the block style in the RTE.
I understand how to add some classes there, but I have a simple 
question: how to remove the 2 options "Frame with grey background" and 
"Frame with yellow background".

Is the only way setting ignoreMainStyleOverride = 1 and redefine the 
justify classes again?

thx Dieter