code: func (win *Window) MenubarEnd() {
  	layout := win.layout
  
  	layout.Menu.H = layout.AtY - layout.Menu.Y
  	layout.Clip.Y = layout.Bounds.Y + layout.HeaderH + layout.Menu.H + layout.Row.Height
  	layout.Height -= layout.Menu.H
  	*layout.Offset = layout.Menu.Offset
  	layout.Clip.H -= layout.Menu.H + layout.Row.Height
  	layout.AtY = layout.Menu.Y + layout.Menu.H
  	win.cmds.PushScissor(layout.Clip)
  }
docs: // MenubarEnd signals that all widgets have been added to the menubar.