[TYPO3] RTE issue in BE in typo3 ver 4.0. ..

[nirmalya[5e,India]]

hello,
i've loaded ext- "rtehtmlarea" in typo3 ver 4.0.
the Buttons in RTE is shown in BE
i)but not functioning ...
ii)i wanna include "myclasses" from "myStylesSheet.css" at BE RTE
	??
thank you.
nirmalya,

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