You can add a couple of subreports to your master report which will not be expanded by default. And when the user expands the subreports which they want the reports will be rendered.
Another thing that you should be aware of is that there is a known issue of the toggle visibility. Even though the expand of the toggle visibility is removed, when the report is rendered this option is not respected. A fix for this will be delivered in a subsequent version of Telerik Reporting. Please, excuse us for the inconvenience.
the Telerik team
Register for the Q2 2011 What's New Webinar Week. Mark your calendar for the week starting July 18th and book your seat for a walk through of all the exciting stuff we will ship with the new release!