vb.net hotkey registration with 2 modifiers - vb.net

Question

I’m working on a project that I need to register a hot key for, any I’m running into a wall trying to figure out how to add another letter modifier to the hotkey registrar. For example, CTRL+SHIFT, A+B. As of right now the code that I’m running works, but it only accepts one letter modifier. Can anyone show me where I’m going wrong? I was hoping it was as simple as adding the ‘And’ operant or ‘+’ to concatenate it as a string. Here’s an example of what I have that works.
Imports System.Runtime.InteropServices
Public Class Form1
Public Const MOD_ALT As Integer = &H1
Public Const MOD_SHIFT As Integer = &H4
Public Const MOD_CTRL As Integer = &H2
Public Const MOD_WIN As Integer = &H8
Public Const WM_HOTKEY As Integer = &H312
<DllImport("User32.dll")>
Public Shared Function RegisterHotKey(ByVal hwnd As IntPtr, ByVal id As Integer, ByVal fsModifiers As Integer, ByVal vk As Integer) As Integer
End Function
<DllImport("User32.dll")>
Public Shared Function UnregisterHotKey(ByVal hwnd As IntPtr, ByVal id As Integer) As Integer
End Function
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
RegisterHotKey(Me.Handle, 100, MOD_ALT Or MOD_SHIFT, Keys.A)'alt+shift,A
End Sub
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
If m.Msg = WM_HOTKEY Then
Dim id As IntPtr = m.WParam
Select Case (id.ToString)
Case "100"
MessageBox.Show("You pressed alt+shift, A", "Hello", MessageBoxButtons.OK, MessageBoxIcon.Warning)
End Select
End If
MyBase.WndProc(m)
End Sub
Private Sub Form1_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
UnregisterHotKey(Me.Handle, 100)
End Sub
End Class
Like I said, this works so far, CTRL+SHIFT, A. What I’d like to do is modify it to accept an additional modifier key like, CTRL+SHIFT, A+B. Thank you in advance for your help!