Why is it so difficult to set the location of Splitter? - vb.net

Question

The content of the codes given below;
3 panels and 2 Splitter are required. However, the 2nd splitter (Green) must be located between the gray and brown panel. But not in the right place. Are there any suggestions?
Thanks.
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Me.Show()
Dim tmpSplitter As Splitter
Dim tmpPanel As Panel
Dim MainPanel As Panel
' This is main panel
'
MainPanel = New Panel
With MainPanel
.Name = "MainPanel"
.Dock = DockStyle.Fill
.BackColor = Color.LightGray
.BorderStyle = BorderStyle.Fixed3D
.Visible = True
End With
Me.Controls.Add(MainPanel)
' 1: First Top Panel and Splitter
'
tmpPanel = New Panel
With tmpPanel
.Name = "Panel1"
.Dock = DockStyle.Top
.BackColor = Color.Red
.Visible = True
End With
tmpSplitter = New Splitter
With tmpSplitter
.Name = "Split1"
.Dock = DockStyle.Top
.BackColor = Color.Blue
.Cursor = Cursors.HSplit
End With
Me.Controls.Add(tmpSplitter)
Me.Controls.Add(tmpPanel)
' 2: Second Panel added to the left side of the main panel
'
MainPanel.Dock = DockStyle.Right
MainPanel.Size = New Size(MainPanel.Width * 0.5, MainPanel.Height)
Dim btn As New Button
btn.Size = New Size(10, 50)
btn.Location = New Point(MainPanel.Location.X - btn.Width, MainPanel.Location.Y)
Me.Controls.Add(btn)
tmpPanel = New Panel
With tmpPanel
.Size = New Size(10, MainPanel.Height)
.Location = New Point(MainPanel.Location.X - .Width - 5, MainPanel.Location.Y)
.Name = "Panel2"
.Dock = DockStyle.Fill
.BackColor = Color.Brown
End With
' THIS SPLITTER IS NOT IN THE RIGHT PLACE. Must be between brown and gray panel
'
tmpSplitter = New Splitter
With tmpSplitter
.Size = New Size(5, MainPanel.Height)
.Location = New Point(MainPanel.Location.X - .Width, MainPanel.Location.Y)
.Name = "Split2"
.Dock = DockStyle.Right
.BackColor = Color.Green
.Cursor = Cursors.VSplit
End With
Me.Controls.Add(tmpSplitter)
Me.Controls.Add(tmpPanel)
End Sub
End Class

Answer 1

a little more research and try to solve the solution
Me.Controls.SetChildIndex (tmpSplitter, 0)
is enough to write on the last line. Thank you for your contributions.