Bold a dynamic text box is not working...

Dear Friends,

i neeed to create a text box with bold letter. my coding is as follows.

but it always shows bold, even i gave tf1.bold = false.

    reptitle.text = options[0][0].tit;
    var tf1:TextFormat = new TextFormat();
    tf1.color = options[0][0].col;
    tf1.size = options[0][0].siz;
    tf1.bold = options[0][0].bol;
    reptitle.setTextFormat(tf1);
    trace("bold :"+tf1.bold + " dat :"+options[0][0].bol);

Note: where options[0][0] is an array has all the properties bold = true/false, color = 0x----.

Any body can clarify me.. i got struct up..pls..

Thanks and Regards,

Syed Abdul Rahim