[Pharo-project] How get font instance programmatically?

Hello, My task very simple. I need set some font for TextMorph instance programmatically. I found TextStyle>>named: familyName . But it search font in TextConstants that not include my font. By my font exists in visual font chooser from halo menu in text morph. How I can get font instance that I see in FontChooser (that appears by halo menu)? P.S. I try set for my text morph default Pharo 1.0 DejavuSans font