'Codigo Interezante para forzar transparencia en un form de manera muy sencilla y con transparencia graduable
Private Declare Function GetWindowLong Lib "USER32" Alias "GetWindowLongA" _
(ByVal hWnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "USER32" Alias "SetWindowLongA" _
(ByVal hWnd As Long, ByVal nIndex As Long, _
ByVal dwNewLong As Long) As Long
Private Const GWL_STYLE = (-16)
Private Const GWL_EXSTYLE = (-20)
'Requires Windows 2000 or later:
Private Const WS_EX_LAYERED = &H80000
Private Declare Function SetLayeredWindowAttributes Lib "USER32" (ByVal hWnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long
Private Const LWA_COLORKEY = &H1
Private Const LWA_ALPHA = &H2
Public Sub MakeWindowTransparent(ByVal hWnd As Long, ByVal alphaAmount As Byte)
Dim lStyle As Long
lStyle = GetWindowLong(hWnd, GWL_EXSTYLE)
lStyle = lStyle Or WS_EX_LAYERED
SetWindowLong hWnd, GWL_EXSTYLE, lStyle
SetLayeredWindowAttributes hWnd, 0, alphaAmount, LWA_ALPHA
End Sub
'La transparencia es graduable modificando el alphaamount en este caso esta en 150 mientras menor es este valor mas transparente se torna
Private Sub Form_Load()
Call MakeWindowTransparent(Form1.hWnd, 150)
End Sub