Gringo commands are:
- button name x y caption [width]
- entry name x y [initial_text] [width]
    but you cannot use "entry c 2 4"
- grid name x y width height 
    "a11"	"a12"	"a13"
    "a21"	"a22"	"a23"
    .....................
  end grid
- list name x y width height
    "entry 1"
    "entry 2"
    "entry 3"
    "entry 4"    
  end list     
- label x y text [width]
- window name x y w h title
- checkbox

You can use ',' to separate arguments.
