Overriding VB.Net TrackBar control Property -- no error, but not working - vb.net

Question

All,
If a TrackBar control on a Windows form is selected by mouse, the keyboard left/right arrow keys can be used to decrement/increment its value respectively. Unfortunately, selecting the control causes an unsightly focus box to appear around it.
I would like to override the control's ShowFocusCues() Property to hide the focus box but retain the ability to use the keyboard keys. The following code does not throw an error, but also does not return the result I wish to achieve. Please can you help?
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim myTrackBar As CustomTrackBar = New CustomTrackBar
With myTrackBar
.Top = 100
.Left = 100
.Width = 200
.Minimum = 3
.Maximum = 25
.Value = 7
End With
Me.Controls.Add(myTrackBar)
End Sub
End Class
Class CustomTrackBar : Inherits System.Windows.Forms.TrackBar
Protected Overloads Overrides ReadOnly Property ShowFocusCues() As Boolean
Get
Return False
End Get
End Property
End Class

Answer 1

I just would like to preserve keyboard functionality if doing so is straightforward
I don't doubt the way Jimi has suggested in the comments is more correct, but it's really straightforward to put a eg a 300x50 sized trackbar inside an eg 290x40 sized panel, positioned at -5,-5 so the focus box is visually cut off.
Note that I don't guarantee these pixel sizes are exact/correct so they should be regarded as "for illustration of the point purposes only"; I'm on a cellphone and cannot measure the image I created to demo this, but it looks like the focus rect is less than 5 pixels...
In this image the cutoff is more than 5 pixels - I deliberately positioned the trackbar so that part of the slider is cut off to demonstrate that controls inside panels, that overhang the bounds of the panel, have their visual area trimmed:
The form background is blue, the panel grey and the trackbar is yellow
add a panel to the form
set your trackbar background to red temporarily so you can see its bounds
drag the trackbar into the panel then drag it again to the top left corner
use the arrow keys eg 5 times in the up and left directions to push it
size the panel to the bottom right of the trackbar
hold shift and use up/left again to resize the panel down another 5 pixels in each dimension
if you're resizing this trackbar set the anchor properties appropriately on the trackbar and panel
revert the background
If you don't use anchor for resize/don't know how it works, it's simplest to consider it like:
Any edge that is anchored maintains the same number of pixels between that edge and the same edge of the container it is in. Controls try not to resize if they can
This means that anchoring left and right will cause a control to stretch if the window gets wider. Anchoring right only causes the control to slide as the window gets wider