Option Explicit

Private Const WM_LBUTTONDOWN As Long = &H201
Private Const WM_LBUTTONUP As Long = &H202

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Integer, ByVal lParam As Any) As Long
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Long, ByVal hWnd2 As Long, ByVal lpsz1 As String, ByVal lpsz2 As String) As Long

Private Sub Command1_Click()
    Call Beep
End Sub

Private Function FindCommand(ByVal lHost As Long) As Long
    FindCommand = FindWindowEx(lHost, 0, "ThunderCommandButton", vbNullString)
End Function

Private Sub PulseButton(ByVal hWnd As Long)
    Call SendMessage(hWnd, WM_LBUTTONDOWN, 0, 0&)
    Call SendMessage(hWnd, WM_LBUTTONUP, 0, 0&)
End Sub

Private Sub Timer1_Timer()
    PulseButton FindCommand(Me.hWnd)
End Sub