code: func (f *Frame) AddText(text string, header bool, align int, color tcell.Color) *Frame {
  	f.text = append(f.text, &frameText{
  		Text:   text,
  		Header: header,
  		Align:  align,
  		Color:  color,
  	})
  	return f
  }
docs: // AddText adds text to the frame. Set "header" to true if the text is to appear
  // in the header, above the contained primitive. Set it to false for it to
  // appear in the footer, below the contained primitive. "align" must be one of
  // the Align constants. Rows in the header are printed top to bottom, rows in
  // the footer are printed bottom to top. Note that long text can overlap as
  // different alignments will be placed on the same row.