Custom Control Display Issue - vb.net

Question

I have created this class in visual Basic it works fine but there is a slight design issue. As you can see there is this small bumb, how can I fix this? And also, how can I fix the spacing between the content Box and the selection menu.
Public Class VerticallTabControll
Inherits TabControl
Sub New()
SetStyle(ControlStyles.AllPaintingInWmPaint Or ControlStyles.OptimizedDoubleBuffer Or ControlStyles.ResizeRedraw Or ControlStyles.UserPaint, True)
DoubleBuffered = True
SizeMode = TabSizeMode.Fixed
ItemSize = New Size(30, 170)
End Sub
Protected Overrides Sub CreateHandle()
MyBase.CreateHandle()
Alignment = TabAlignment.Left
End Sub
Protected Overrides Sub OnPaint(e As PaintEventArgs)
Dim selected As New SolidBrush(Color.FromArgb(0, 122, 204))
Dim notSelected As New SolidBrush(Color.FromArgb(63, 63, 70))
Dim B As New Bitmap(Width, Height)
Dim G As Graphics = Graphics.FromImage(B)
G.Clear(Color.FromArgb(63, 63, 70))
For i = 0 To TabCount - 1
Dim TabRectangle As Rectangle = GetTabRect(i)
If i = SelectedIndex Then
'// if tab is selected
G.FillRectangle(selected, TabRectangle)
Else
'// tab is not selected
G.FillRectangle(notSelected, TabRectangle)
End If
'Line Test
'Dim start As New Point(10, 31 * (i + 1))
'Dim ende As New Point(160, 31 * (i + 1))
'G.DrawLine(Pens.White, start, ende)
G.DrawString(TabPages(i).Text, Font, Brushes.White, TabRectangle, New StringFormat With {.Alignment = StringAlignment.Center, .LineAlignment = StringAlignment.Center})
Next
e.Graphics.DrawImage(B.Clone, 0, 0)
G.Dispose() : B.Dispose() : selected.Dispose() : notSelected.Dispose()
MyBase.OnPaint(e)
e.Dispose()
End Sub
End Class

Answer 1

You can try overriding the DisplayRectangle property to adjust the interior space accordingly:
Public Overrides ReadOnly Property DisplayRectangle As Rectangle
Get
Return New Rectangle(MyBase.DisplayRectangle.Left,
MyBase.DisplayRectangle.Top - 2,
MyBase.DisplayRectangle.Width + 2,
MyBase.DisplayRectangle.Height + 4)
End Get
End Property