title: Trying to add UserControl to a TabPage inside of another TabPage get NullReferenceException
body: <p>I have an UserControl and wish to add it to a TabPage Inside another TabPage but get NullReferenceException instead.</p>
  
  <p>My code</p>
  
  <pre><code>Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
  
      Dim MyControl As New TimerPanel
      Dim Ubicacion As Point
      Ubicacion.X = 274
      Ubicacion.Y = 100
      With MyControl
          .Name = "Timer0"
          .NombreTimerTxt.Text = "Timer GPS"
          .TimerBox.Text = "Timer 00"
          .Parent = Me '.TabControl3.TabPages("Timers")
          .Location = Ubicacion
          .Visible = True
  
      End With
  
      Me.TabControl3.TabPages("Timers").Controls.Add(MyControl) 'Error here
  
      'Me.TabControl1.TabPages("Timers").Controls("Timer0").Location = Ubicacion
  End Sub
  </code></pre>
  
  <p>The IDE say that I must declare it using the word "New", but I already did it on the first code line.</p>
  
  <p>Another thing, If I iterate this code changing the name and coordinates I will get independent controls or when I change one all do the same?</p>
  
  <p>My form looks like this.</p>
  
  <p><img src="https://i.stack.imgur.com/wr5E3.png" alt="Tab inside tab example"></p>