Giving effect to a mc which has dynamictext

hi everybody,

i use a dynamictext in a movieclip that gets the data from XML.
i want to give an effect this text, i put dynamictext into a movieclip, and i use movieclip to give effect, but when i use mask on this mc, data doesn’t displayed or when i change the alpha in tweenmotion, this changes don’t be active…

can’t i give any effect to a movieclip which has a dynamic text in?

thanks everybody for helps…