I'm trying to use the ChildWindowFromPointEX function which is defined as :

Public Declare Function ChildWindowFromPointEx Lib "user32" (ByVal hWnd As Long, ByVal pt As POINT, ByVal un As Long) As Long

I have declared the POINT strucure as follows :
Public Type POINT
x As Long
y As Long
End Type

I can pass this POINT structure by reference (to other functions) without any trouble but I get compile errors when I try to pass it byVal. I tried declaring the variable ByRef but then I get a runtime "Bad DLL calling convention error"

Any ideas ??