IEHTMLWindow - how to disable drag/drop

Hi,

I have an IEHTMLWindow with a notebook, and I want to disable drag/
drop of the IEHTMLWindow so that the drag/drop event can be processed
by a higher level frame.

This is my code (self is the toplevel frame):

self.leftNotebook.Freeze()
            self.ie = iewin.IEHtmlWindow(self.leftNotebook,
style=wx.NO_FULL_REPAINT_ON_RESIZE)
            self.leftNotebook.AddPage(self.ie, self.evalapp.docstitle)
            self.leftNotebook.Layout()
            self.ie.CallAXMethod('PutProperty',
'RegisterAsDropTarget', False)

Unfortunately, the 'PutProperty' call doesn't seem to be working. Any
suggestions? One way to disable this is to call Disable() on the
window, but this isn't an option for me because it isn't specific
enough.

Thanks,
Sid