（仅供参考）

动态创建菜单，鼠标右键弹出菜单，执行对应鼠标事件
'窗体
Option Explicit
Private Sub Form_Load()
    hMenu = CreateMenu()
    hmenupopup = CreatePopupMenu()
    result = AppendMenu(hmenupopup, MF_STRING, 300, "&New")
    result = AppendMenu(hmenupopup, MF_STRING, 301, "&Save")
    result = AppendMenu(hmenupopup, MF_STRING, 302, "Save &As...")
    result = AppendMenu(hMenu, MF_POPUP, hmenupopup, "&File")
    oldwinproc = GetWindowLong(Me.hWnd, GWL_WNDPROC)
    SetWindowLong Me.hWnd, GWL_WNDPROC, AddressOf OnMenu
End Sub

Private Sub Form_MouseDown(Button As Integer, Shift As Integer, x As Single, y As Single)
    Dim r As RECT
    Dim p As POINTAPI
    If Button = vbRightButton Then
        GetCursorPos p
        TrackPopupMenu hmenupopup, 0, p.x, p.y, 0, Me.hWnd, r
    End If
End Sub

Private Sub Form_Unload(Cancel As Integer)
    SetWindowLong Me.hWnd, GWL_WNDPROC, oldwinproc
End Sub
'模块
Option Explicit

Public Declare Function CreateMenu Lib "user32" () As Long
Public Declare Function AppendMenu Lib "user32" Alias "AppendMenuA" (ByVal hMenu As Long, ByVal wFlags As Long, ByVal wIDNewItem As Long, ByVal lpNewItem As Any) As Long
Public Declare Function TrackPopupMenu Lib "user32" (ByVal hMenu As Long, ByVal wFlags As Long, ByVal x As Long, ByVal y As Long, ByVal nReserved As Long, ByVal hWnd As Long, lprc As RECT) As Long
Public Declare Function CreatePopupMenu Lib "user32" () As Long
Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Public Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long) As Long
Public Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Public Const MF_STRING = &H0&
Public Const MF_POPUP = &H10&
Public Const WM_USER = &H400
Public Type RECT
        Left As Long
        Top As Long
        Right As Long
        Bottom As Long
End Type
Public Type POINTAPI
        x As Long
        y As Long
End Type
Public Const GWL_WNDPROC = (-4)
Public hMenu As Long
Public hmenupopup As Long
Public result As Long
Public oldwinproc As Long
Public Const WM_COMMAND = &H111

Public Function OnMenu(ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    Select Case wMsg
        Case WM_COMMAND
            Select Case wParam
                Case 300
                    MsgBox "u select new", vbInformation, "hello, world!"
                Case 301
                    MsgBox "u select save", vbInformation, "hello, world!"
                Case 302
                    MsgBox "u select save as", vbInformation, "hello, world!"
            End Select
    End Select
    OnMenu = CallWindowProc(oldwinproc, hWnd, wMsg, wParam, lParam)
End Function