code: func NewGrid() *Grid {
  	g := &Grid{
  		Box:          NewBox().SetBackgroundColor(tcell.ColorDefault),
  		bordersColor: Styles.GraphicsColor,
  	}
  	g.focus = g
  	return g
  }
docs: // NewGrid returns a new grid-based layout container with no initial primitives.
  //
  // Note that Box, the superclass of Grid, will have its background color set to
  // transparent so that any grid areas not covered by any primitives will leave
  // their background unchanged. To clear a Grid's background before any items are
  // drawn, set it to the desired color:
  //
  //   grid.SetBackgroundColor(tview.Styles.PrimitiveBackgroundColor)