code: func (t *TextBar) Size() (int, int) {
  	w, h := 0, 0
  
  	ww, wh := t.left.Size()
  	w += ww
  	if wh > h {
  		h = wh
  	}
  	ww, wh = t.center.Size()
  	w += ww
  	if wh > h {
  		h = wh
  	}
  	ww, wh = t.right.Size()
  	w += ww
  	if wh > h {
  		h = wh
  	}
  	return w, h
  }
docs: // Size implements the Size method for Widget, returning the width
  // and height in character cells.