changing format of text - can't!!!

i have textfield inside mc. when roll on event triggered.



in fuction can this

code:

event.currenttarget.getchildat(0).text="fred";

and text changes - being targetted



i want change format of text thought

code:

event.currenttarget.getchildat(0).defaulttextformat=mtitle_fmt;

but, doesn't work.



it says "referenceerror: error #1037: cannot assign method settextformat on flash.text.textfield.
at index001_fla::maintimeline/overhandler()"



any pointers please



thanks

click file/publish settings/flash/permit debugging , retest.  using line number in error message confirm error message references line of code displayed here.

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