title: Using chart and tooltip
body: <p>I'm in internship for a month and i'm using  Chart and tooltip :</p>
  
  <pre><code>Dim serie As System.Windows.Forms.DataVisualization.Charting.Series = mydata.getSeries()
  For i = 0 To serie.Points.Count - 1
      For Each ser As System.Windows.Forms.DataVisualization.Charting.Series In Chart1.Series
                          ser.Points.Add(serie.Points(i))
         Next
  Next
  'Chart1.Series(1).LabelToolTip = "why" 
  </code></pre>
  
  <p>Points I add to ser has tooltip but when i launch the app, i can't see tooltip.
  If i uncomment the last line, i can see the tooltip.
  I can put anything to replace "why" but i must put something or i couldn't see tooltip of point. So atm my code works but i dont understand why I need this line  </p>
  
  <pre><code>Chart1.Series(1).LabelToolTip = "why"
  </code></pre>
  
  <p>I would like to understand my code ^^</p>
  
  <p>Thanks and sorry for my bad english</p>