Change Font for PsdTextFrame

I want to change the Font for PsdTextFrame in psd file. Can you please give me advise.

I try to use code as beblow but I can't

var textFrame = (PsdTextFrame)frame;

textFrame.Font = Aurigma.GraphicsMill.Drawing.Font("Arial", 1);

If I use graphics to raw new string with new font , I don't know how to add a new bitmap to current PSD.

using (var graphics = bitMap.GetAdvancedGraphics())

{

var font = FontRegistry.Installed.CreateFont("Arial", textFrame.FontSize, graphics.DpiX, graphics.DpiY);

var text = new PlainText("MODESTO SR", font);

int y = textFrame.Y - (int)text.GetBlackBox().Top;

text.Position = new System.Drawing.PointF(textFrame.X, y);

graphics.DrawText(text);

}

--> 2 ways above can't have me change Font. Please help me to check.

Thanks,

Duy