Keep Coding

So I was working on a transparent add-on VB.net program that will be clickable only if you click shift. E.g. It will just stay there but clicks will go through it unless I hold shift f.e
I saw this and tested the codes,
VB.net Click through form
However I tried to change some controls but none are able to give me a kind of "toggle". Any clue of what I can fix for it?
Answers in C# are welcome as well as I can program C# instead if it is not do-able in VB
Edit: Code I have been trying to use is this
Imports System.Runtime.InteropServices
Public Class Form1
Private InitialStyle As Integer
Dim PercentVisible As Decimal
Private Sub Form_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
InitialStyle = GetWindowLong(Me.Handle, -20)
PercentVisible = 0.8
SetWindowLong(Me.Handle, -20, InitialStyle Or &H80000 Or &H20)
SetLayeredWindowAttributes(Me.Handle, 0, 255 * PercentVisible, &H2)
Me.BackColor = Color.Red
Me.TopMost = True
End Sub
<DllImport("user32.dll", EntryPoint:="GetWindowLong")> Public Shared Function GetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer) As Integer
End Function
<DllImport("user32.dll", EntryPoint:="SetWindowLong")> Public Shared Function SetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer, ByVal dwNewLong As Integer) As Integer
End Function
<DllImport("user32.dll", EntryPoint:="SetLayeredWindowAttributes")> Public Shared Function SetLayeredWindowAttributes(ByVal hWnd As IntPtr, ByVal crKey As Integer, ByVal alpha As Byte, ByVal dwFlags As Integer) As Boolean
End Function
End Class

I found the color to make all the difference; afaik this is a legacy bug/feature we can make use of.
Here is a minimal example:
public Form1()
{
InitializeComponent();
BackColor = Color.FromArgb(123,234,34);
TransparencyKey = BackColor;
Text = "Click Me!";
KeyPreview = true;
}
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Shift)
{
BackColor = Color.Fuchsia;
TransparencyKey = BackColor;
Text = "Click Through!";
}
}
private void Form1_KeyUp(object sender, KeyEventArgs e)
{
BackColor = Color.FromArgb(123,234,34);
TransparencyKey = BackColor;
Text = "Click Me!";
}