SystemMenu add click event - vb.net

Question

I have a code that append menu in the system menu(right click form title bar). How will i add click event in the two menus that i appended? this is the code i use:
Public Class AppendFormSysMenu
<DllImport("user32.dll", CharSet:=CharSet.Auto, SetLastError:=True)>
Private Shared Function AppendMenu(ByVal hMenu As IntPtr, ByVal uFlags As Int32, ByVal uIDNewItem As IntPtr, ByVal lpNewItem As String) As Boolean
End Function
Private Declare Function GetSystemMenu Lib "user32" (ByVal hWnd As IntPtr, ByVal bRevert As Boolean) As IntPtr
Private SYSMENU_SAVE_FORM_ID As Integer = &H1
Private SYSMENU_RESTORE_FORM_ID As Integer = &H2
<Flags()>
Public Enum MenuFlags As Integer
MF_BYPOSITION = 1024
MF_REMOVE = 4096
MF_SEPARATOR = 2048
MF_STRING = 0
End Enum
Public Sub insertSeparator(frm As Form)
Dim hMenu = GetSystemMenu(frm.Handle, False)
AppendMenu(hMenu, MenuFlags.MF_SEPARATOR, 0, Nothing)
End Sub
Public Sub insertSaveMenu(frm As Form, ByVal strMenuItem As String)
Dim hMenu = GetSystemMenu(frm.Handle, False)
AppendMenu(hMenu, MenuFlags.MF_STRING, SYSMENU_SAVE_FORM_ID, strMenuItem)
End Sub
Public Sub insertRestoreMenu(frm As Form, ByVal strMenuItem As String)
Dim hMenu = GetSystemMenu(frm.Handle, False)
AppendMenu(hMenu, MenuFlags.MF_STRING, SYSMENU_RESTORE_FORM_ID, strMenuItem)
End Sub
End Class
This is the code i use in the form:
Dim AppendFormMenu As New AppendFormSysMenu
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
AppendFormMenu.insertSeparator(Me)
AppendFormMenu.insertSaveMenu(Me, "Save Form Position")
AppendFormMenu.insertRestoreMenu(Me, "Restore Form Position")
End Sub