Groupbox in SplitContainer UserControl

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VB

Hi all,
I am having a problem with a user control.
My user control inherits from SplitContainer.
Now I want to add a groupbox to both panels.
The problem is that when I do this I can't add controls to it.
So if I put my user control on a form and I drag, for example, a button on my groupbox (inside a panel) my button will be placed on the panel and not in the groupbox on the panel. This makes my button not visible.

Public Class MySplitter
   Inherits SplitContainer

Public m_Groupbox1 As GroupBox

   Public Sub New()
      MyBase.New()

      ' This call is required by the Windows Form Designer.
      InitializeComponent()

      ' Add any initialization after the InitializeComponent() call.
      InitGB

   End Sub

   Private Sub InitGB()
      m_Groupbox1 = New GroupBox
      m_Groupbox1.Name = "GroupBox1"
      m_Groupbox1.Text = "Hello"
      m_Groupbox1.Dock = DockStyle.Fill
      Me.Panel1.Controls.Add(m_Groupbox1)
End Sub

Any suggestions on how I would make this work?
Thanks