hiding caret in RichText?

Does anyone have advice as to how the caret or cursor at the end of a rich text control can be hidden?

Using Hide() doesn't work for us:

         desc.Thaw()
         desc.GetCaret().Hide()

I found one reference to a proposed patch to wxWidgets, but I didn't quite understand if I could somehow duplicate that approach in our own code.

Our source is here (do a find on "Caret" to see where we've tried to use "Hide()":

https://updatecenter2.dev.java.net/source/browse/updatecenter2/trunk/project/updatetool/mainframe.py?view=markup

Thanks in advance,
Chris