wxp tags

I am opening a html file using myhtmlwin = wx.html.HtmlWindow(...)

The html file (call it test.htm) contains blocks of code like the
following:

<wxp module="wx" class="CheckBox">
    <param name="label" value=I>
    <param name="id" value=5100>
</wxp>

The html displays fine, the wxp tags are all parsed and displayed
correctly.

My question is, once the file has been loaded [ using
myhtmlwin.LoadPage(test.htm) ], how can I interact with that checkbox
(i.e. from within my python script, have it automatically check the
checkbox with id 5100, created from the test.htm file)?

-- Vince