how to read Text from html control?

Hi

I am developing a application that enumerates all active window on windows mobile and check for live messenger window.
if it found then it enumerates child window of it and last try to read text from chat window.

In windows mobile live messenger is using HTML control view to display chat area.
the problem is getwindowtext simply fails as it is HTML control. how to read text from it?
I tried by sending DTM_DOCUMENTDISPATCH message to it but it didn't return dispatch pointer.

please guide me.