code: func (win *Window) ComboSimple(items []string, selected int, item_height int) int {
  	if len(items) == 0 {
  		return selected
  	}
  
  	item_height = win.ctx.scale(item_height)
  	item_padding := win.ctx.Style.Combo.ButtonPadding.Y
  	window_padding := win.style().Padding.Y
  	max_height := (len(items)+1)*item_height + item_padding*3 + window_padding*2
  	if w := win.Combo(label.T(items[selected]), max_height, nil); w != nil {
  		w.RowScaled(item_height).Dynamic(1)
  		for i := range items {
  			if w.MenuItem(label.TA(items[i], "LC")) {
  				selected = i
  			}
  		}
  	}
  	return selected
  }
docs: // Adds a drop-down list to win. The contents are specified by items,
  // with selected being the index of the selected item.