title: Hover for different items from legend in Bokeh multiline chart
body: <p>How can I create a hoover for a Bokeh multiline graph where the hover shows data only for the current line?
  Example:
  I have line1 and line2.
  When I hover over line1 I want to see:</p>
  <p>Values: values</p>
  <p>Line: name of the line</p>
  <p><a href="https://i.stack.imgur.com/OBT9v.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OBT9v.png" alt="enter image description here" /></a></p>
  <p>Here is my code:
  graph:</p>
  <pre><code>fig2 = figure(x_range=x, y_range=[0, 1], plot_width=1500, 
  plot_height=600)
  line1_2 = fig2.line(x, churn_40d_12m_all, color='blue', line_width=2)
  circle1_2 = fig2.circle(x, churn_40d_12m_all, color='blue')
  line2_2 = fig2.line(x, churn_40d_12m_b2b, color='brown', line_width=2)
  circle2_2 = fig2.circle(x, churn_40d_12m_b2b, color='brown')
  line3_2 = fig2.line(x, churn_40d_12m_b2c, color='green', line_width=2)
  circle3_2 = fig2.circle(x, churn_40d_12m_b2c, color='green')
  line4_2 = fig2.line(x, churn_40d_6m, color='red', line_width=2)
  circle4_2 = fig2.circle(x, churn_40d_6m, color='red')
  fig2.xaxis.axis_label = 'Month'
  fig2.xaxis.major_label_orientation= math.pi/2
  fig2.xaxis.axis_label_text_font_size = &quot;20px&quot;
  fig2.yaxis.axis_label_text_font_size = &quot;20px&quot;
  fig2.yaxis.axis_label = 'Values'
  fig2.yaxis[0].formatter = NumeralTickFormatter(format=&quot;0.0%&quot;)
  fig2.add_tools(hover)
  fig2.add_layout(Legend(), 'right')
  legend2 = Legend(items=[
      (&quot;Line1&quot;, [line1_2, circle1_2]),
      (&quot;Line2&quot;, [line2_2, circle2_2]),
      (&quot;Line3&quot;, [line3_2, circle3_2]),
      (&quot;Line4&quot;, [line4_2, circle4_2]),
  ], location=&quot;top_right&quot;)
  fig2.add_layout(legend2, 'right')
  legend2.click_policy = 'hide'
  legend2.title=&quot;MultilineChart1&quot;
  legend2.title_text_font_size = &quot;20px&quot;
  legend2.title_text_font_style = &quot;bold&quot;
  legend2.label_text_font_size = &quot;15px&quot;
  tab2 = Panel(child=fig2, title=&quot;MultiLineChart1&quot;)
  </code></pre>
  <p>Hover code:</p>
  <pre><code>hover = HoverTool(tooltips=[
      ('Values', '@y{0.00 %}'),
      ('Line', 'name of the current line')
  ])
  </code></pre>
  <p>Thank you!</p>