DynamicText Problem

Hi All,

I have a dynamic text box in stage and am passing text to the dynamic text box during runtime , the problem is how to make the text in the dynamic text box to bold , i have tried in many ways like

>for the dynamic text box enabled the Bold button during authoring time ,
>through action script i have given the following code and tried
_root.myText.bold=true .

but nothing is working , can anyone tell wat am doing wrong?

Thanks,
Saddu.