SOAP API Rendering In HTML4.0 format with Toggle Items

I have been combing the Internet trying to find a way to use the SOAP API 
(ReportExecution2005) web service to render a report to HTML4.0 format with 
toggle items.  From what I have read, the new web services should provide 
ASP.NET server-side postbacks from the toggle item images, but so far I have 
seen only the same behavior as was in RS 2000, which was that the toggle item 
images pointed back to the ReportServer address.  The following is the device 
info settings that i have used to get the images to show up on the aspx page:

<DeviceInfo><StreamRoot></StreamRoot><Toolbar>False</Toolbar>
                <Parameters>False</Parameters>
                <HTMLFragment>False</HTMLFragment>
                StyleStream>False</StyleStream>
                <Section>0</Section>
                DeviceInfo>

If I switch the HTMFragment to True I don't get any toggle item images to 
render on the page but the report still shows up, and when I actually set the 
StreamRoot paramter to something like this 
"http://[server]/[virtualdirectory]/GetImage.aspx?reportpath=[path]&streamid=" to render the toggle item images, I get a http 400 : Bad Request error page.

Can someone please provide some information or sample code on how to render 
an HTML4.0 report using the SQL 2005 Reporting Services web service and 
getting the toggle item images to render as well as work correctly.

Thanks,

Brian