code: func (win *Window) Row(height int) *rowConstructor {
  	win.rowCtor.height = win.ctx.scale(height)
  	return &win.rowCtor
  }
docs: // Changes row layout and starts a new row.
  // Use the returned value to configure the new row layout:
  //  win.Row(10).Static(100, 120, 100)
  // If height == 0 all the row is stretched to fill all the remaining space.