Hi Denis,

Try with this:

Regards,

#DEFINE GWL_EXSTYLE 0xffffffec
#DEFINE WS_EX_DLGMODALFRAME 0x00000001

DECLARE INTEGER GetWindowLong IN Win32API INTEGER hWnd, INTEGER nIndex
lResult = GetWindowLOng( hWnd, GWL_EXSTYLE )

IF( BITAND( lResult, WS_EX_DLGMODALFRAME ) <> 0 )
MESSAGEBOX("SI")
ELSE
MESSAGEBOX("NO")
ENDIF