XRC modify

[Laslo Forro]

Hi there,
I have an XRC file with a Combobox widget :

 <object class="wxComboBox" name="_project_chooser">
                    <handler event="EVT_COMBOBOX">_combo_event</handler>
                    <style>wxCB_DROPDOWN|wxCB_READONLY</style>
                    <selection>0</selection>
                    <focused>1</focused>
                    <content>
                        <item>New...</item>
                    </content>
                </object>

Can I change the <content> part adding new items dynamically using some
WxXML* module or it it better using some XML module like XML::Twig and feed
it to WxXMLResource?
I thought of using WxXML* but I have not got enlightenment how to do it.
Thanks for the help in advance!
Bests
Laslo