SetLayered..() When SetParent() has been used

I'm trying to get the SetLayeredWindowAttributes() function to make my form semi-transparent after i've changed the parent of the form to GethWndByWinTitle("Program Manager"), but without success.
Here's the part of my code which does this:

Code:

---

Dim DeskH As Long
Dim nullRect As RECT
Dim lret As Long

'Set parent of form to make it stay on bottom
DeskH = GethWndByWinTitle("Program Manager")
Call SetParent(frmMain.hWnd, DeskH)

'Set layered window attributes
lret = GetWindowLong(frmMain.hWnd, GWL_EXSTYLE)
lret = lret Or WS_EX_LAYERED
SetWindowLong frmMain.hWnd, GWL_EXSTYLE, lret
SetLayeredWindowAttributes hWnd, RGB(255, 0, 255), 200, LWA_COLORKEY Or LWA_ALPHA

---

Does anyone know how to make this work?
Thanks in advance.

any ideas?:confused: