code: func (p *Panel) SetStatus(w Widget) {
  	index := 0
  	if p.title != nil {
  		index++
  	}
  	if p.menu != nil {
  		index++
  	}
  	if p.content != nil {
  		index++
  	}
  	if p.status != nil {
  		p.RemoveWidget(p.status)
  	}
  	p.InsertWidget(index, w, 0.0)
  	p.status = w
  }
docs: // SetStatus sets the Widget to display in the status area, which is at
  // the bottom of the panel.