[wxPython] Why cannot "ActiveXWrapper_Acrobat.py" be destroyed?

Hi

Im trying to add this module in my app.
But the module cannot be quitted perfectly after opening a PDF.
The "pythonw.exe" and "AcroRD32.exe" is remained the process of memory after
quitted it.
    class TestFrame(wxFrame):
        def __init__(self):
            wxFrame.__init__(self, None, -1, "ActiveX test -- Acrobat",
size=(640, 480),

style=wxDEFAULT_FRAME_STYLE|wxNO_FULL_REPAINT_ON_RESIZE)
            self.tp = TestPanel(self, sys.stdout)
            EVT_CLOSE(self, self.OnCloseWindow)

        def OnCloseWindow(self, event):
            self.tp.pdf.Cleanup()
            self.Destroy()

The window cannot be destroyed correctly. Why?

Another ActiveXWrapper module "ActiveXWrapper_IE.py" is ok.

Would you mind checking it?

Regards
Chang Mok Song