wx.HtmlListBox with wxp tags not possible?

[Stani's Python Editor]

Hi,
Did anyone succeed to make wx.HtmlListBox work with wxp tags? As an 
example, replace the code for MyHtmlListBox(wx.HtmlListBox) with:

import wx.lib.wxpTag

class MyHtmlListBox(wx.HtmlListBox):

    def OnGetItem(self, n):
        return """<wxp module="wx" class="Button" width="50%">
    <param name="label" value="It works!">
    <param name="id"    value="-1">
</wxp>
"""

If this is not possible, could it be implemented by a 
wx.html.HtmlWinTagHandler? How would the above example look like?

Also I noted the existence of wx.SimpleHtmlListBox. Is this an internal 
class or can it be used?

Stani