title: How to enable grid lines for Holoview Curve
body: <p>When I display Holoview plot there are no gridlines. I am struggling to find out how to switch them on.</p>
  
  <p><a href="https://i.stack.imgur.com/itHKc.png" rel="nofollow noreferrer">Graph without gridlines</a> </p>
  
  <p>Code snippets:</p>
  
  <pre><code>renderer = hv.renderer('bokeh').instance(mode='server')
  
  
  
      plot = hv.Curve(
      data
      , kdims=['observation_time']
      , vdims=vdims
      , extents=(pd.datetime(year=2000, month=1, day=1, hour=0, minute=0, second=0), None, pd.datetime(year=2000, month=1, day=1+days, hour=0, minute=0, second=0), None)
      , label=vdims_str + " "
      )(plot=dict(width=WIDTH))
  
  ...
  
  plot1 = _get_curve(date_index=date_index, vdims_str='total_a')
  plot2 = _get_curve(date_index=date_index, vdims_str='total_b')
  plot3 = _get_curve(date_index=date_index, vdims_str='total_c')
  
  plots = plot1 * plot2 * plot3
  </code></pre>