Hello,
Please have a look at picture 4 on http://www.pocketmindmap.com/indoor/OriginaleEN/Product/Tour/Default.asp?page=10. The right most button on the additional toolbar toggles between (non-editable) XHTML-View and (editable) XHTML Source.
I hope this helps.
Best Regards,
Jutta Klebe
JKRB Software