code: func (f *Frame) SetBorders(top, bottom, header, footer, left, right int) *Frame {
  	f.top, f.bottom, f.header, f.footer, f.left, f.right = top, bottom, header, footer, left, right
  	return f
  }
docs: // SetBorders sets the width of the frame borders as well as "header" and
  // "footer", the vertical space between the header and footer text and the
  // contained primitive (does not apply if there is no text).