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Private Declare Function SetWindowLong Lib "user32" Alias _
    "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, _
    ByVal dwNewLong As Long) As Long

Private Sub Form_Load()
    Dim Resp As Long
    Resp = SetWindowLong(Me.hwnd, -20, &H20&)
    Form1.Refresh
End Sub

Private mAlpha As Long

' Declaraciones para Layered Windows (sólo Windows 2000 y superior)
Private Const WS_EX_LAYERED As Long = &H80000
Private Const LWA_ALPHA As Long = &H2
'
Private Declare Function SetLayeredWindowAttributes Lib "user32" _
    (ByVal hWnd As Long, ByVal crKey As Long, _
    ByVal bAlpha As Long, ByVal dwFlags As Long) As Long

'------------------------------------------------------------------------------
Private Const GWL_EXSTYLE = (-20)

Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _
    (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" _
    (ByVal hWnd As Long, ByVal nIndex As Long) As Long


Private Const RDW_INVALIDATE = &H1
Private Const RDW_ERASE = &H4
Private Const RDW_ALLCHILDREN = &H80
Private Const RDW_FRAME = &H400

Private Declare Function RedrawWindow2 Lib "user32" Alias "RedrawWindow" _
    (ByVal hWnd As Long, ByVal lprcUpdate As Long, ByVal hrgnUpdate As Long, _
    ByVal fuRedraw As Long) As Long


Private Sub Transparente()
        Dim tAlpha As Long
        
        tAlpha = 70 'Modificar aki el valor para hacerlo mas o menos transparente

        '// Set WS_EX_LAYERED on this window
        Call SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) Or WS_EX_LAYERED)
        
        '// Make this window tAlpha% alpha
        Call SetLayeredWindowAttributes(hWnd, 0, (255 * tAlpha) / 100, LWA_ALPHA)
End Sub


Private Sub Form_Load()
    Transparente
End Sub

¿Como se podria aplicar este código a un solo control del Form?

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Const SC_MOVE = &HF010&
Private Const WM_SYSCOMMAND = &H112


Private Sub Form_Resize()
    TransparentForm Me
End Sub

Private Sub MoverFormulario_Click()
    lP = ((Me.Left \ Screen.TwipsPerPixelX) And &HFFFF&)
    lP = lP + (Me.Top \ Screen.TwipsPerPixelY \ &H10000)
    SendMessage Me.hWnd, WM_SYSCOMMAND, SC_MOVE, lP
End Sub

Private Sub CerrarFormulario_Click()
    Form_Unload (1)
End Sub

Private Sub Form_Unload(Cancel As Integer)
    Unload Me
End Sub

Option Explicit

Private Declare Function CreateRectRgn Lib "gdi32" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function CombineRgn Lib "gdi32" (ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long
Private Declare Function SetWindowRgn Lib "user32" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Long) As Long



Public Sub TransparentForm(frm As Form)

    frm.ScaleMode = vbPixels
    
    Const RGN_DIFF = 4
    Const RGN_OR = 2
    
    Dim outer_rgn As Long
    Dim inner_rgn As Long
    Dim wid As Single
    Dim hgt As Single
    Dim border_width As Single
    Dim title_height As Single
    Dim ctl_left As Single
    Dim ctl_top As Single
    Dim ctl_right As Single
    Dim ctl_bottom As Single
    Dim control_rgn As Long
    Dim combined_rgn As Long
    Dim ControlActual As Control
    
    If frm.WindowState = vbMinimized Then Exit Sub
    
    wid = frm.ScaleX(frm.Width, vbTwips, vbPixels)
    hgt = frm.ScaleY(frm.Height, vbTwips, vbPixels)
    outer_rgn = CreateRectRgn(0, 0, wid, hgt)
    border_width = (wid - frm.ScaleWidth) / 2
    title_height = hgt - border_width - frm.ScaleHeight
'Si quieres que se muestre la barra de titulo
'Entonces habilita la siguiente linea ade codigo
    'inner_rgn = CreateRectRgn(border_width, title_height, wid - border_width, hgt - border_width)
    combined_rgn = CreateRectRgn(0, 0, 0, 0)
    CombineRgn combined_rgn, outer_rgn, inner_rgn, RGN_DIFF
    For Each ControlActual In frm.Controls
        If ControlActual.Container Is frm Then
            ctl_left = frm.ScaleX(ControlActual.Left, frm.ScaleMode, vbPixels) + border_width
            ctl_top = frm.ScaleX(ControlActual.Top, frm.ScaleMode, vbPixels) + title_height
            ctl_right = frm.ScaleX(ControlActual.Width, frm.ScaleMode, vbPixels) + ctl_left
            ctl_bottom = frm.ScaleX(ControlActual.Height, frm.ScaleMode, vbPixels) + ctl_top
            control_rgn = CreateRectRgn(ctl_left, ctl_top, ctl_right, ctl_bottom)
            CombineRgn combined_rgn, combined_rgn, control_rgn, RGN_OR
        End If
    Next ControlActual
    SetWindowRgn frm.hWnd, combined_rgn, True
End Sub