How to create a custom Table Of Contents for merged reports with page indexes

This code example illustrates how to create a custom "Table Of Contents" in a separate report.
It is necessary to create links between bricks of merged reports manually, after the reports are merged. Get the required bricks from the report using NestedBrickIterator and use the VisualBrick.NavigationPair property to create a link. To provide page indexes for such links, collect "page" bricks to a separate collection and then modify the VisualBrick.Text property value based on Target.Page.Index.