wxHtmlWindow seems to ignore my WXP tags

The code below doesn't seem to work. I can't seem to figure out how I am
breaking things. Anyone have a clue?

# Begin code ...

html = '''
<html>
  <body>

    Where is the button?
    <wxp module="" class="wxButton">
        <param name="label" value="Click here">
        <param name="id" value="wxID_OK">
    </wxp>

  </body>
</html>
'''

from wxPython.wx import *
from wxPython.html import wxHtmlWindow

class MyApp( wxApp ):
    def OnInit( self ):
        mf = wxFrame( None, -1, "Hello", size = (800,600) )
        hw = wxHtmlWindow( mf, -1 )
        hw.SetPage( html )
        mf.Centre()
        mf.Show()
        return true

app = MyApp(0)
app.MainLoop()

# end code

Jaime Wyant
Programmer
MSFBINS
601 - 977 - 4291