TextBox: FontSize, FontColor.

Hello. Is it possible to change fontcolor or fontsize in different lines of the TextBox?
In my app I save textual data to *.lit file via TextBox control, and then display
the data in another TextBox control.
So I'm wondering if there can be headers with larger fonts?
Thank you.

I'm afraid not, textbox is limited to a single font style. If you purchased Basic4ppc you could use either the WebBroswer or HtmlPanel additional libraries to do what you want.