How to change TLFTextField direction at runtime?

I create a TLFTextField object at design time and need to change its direction at runtime, how this could be possible?
the following code did not work and simply ignored:
var myText:TLFTextField = MyText;
myText.textFlow.direction = "rtl";
What should I do?

Yes, it work and I was know it, for this reason I emphasis that I created control at "DESIGN time", I want to change the direction of controls that created at design time not creating at runtime with var tf:TLFTextField = new TLFTextField();
To reproduce the problem create TLFText on your scene with text tool and name it "MyText" then
var tf:TLFTextField = MyText; // instead new TLFTextField();
..rest of your code
now you will see that nothing will be change! I struggled many hours but still no success.
Do you have any idea in this case?

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    Thx a lot.
    Max

    Hallo. Thx for the answer. I would like to know if your solution is working always. I mean, in my example i showed you that i have this:
    .mioStileMyriadProBold {
    fontFamily:MyriadPro-Bold;
    fontLookup: embeddedCFF;
    But what if i have 2 custom styles??.. How can i change one or another specifically ??
    I hope you understand what i mean.
    Max

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