The ReportViewerModel is for internal usage only. Please test modifying the viewer's XAML template (Telerik.ReportViewer.Silverlight.xaml) with custom UI which uses the model's properties.
Note that the Document Map area displays navigation links pointing to content of the rendered document. If you want to eliminate content from the document, the approach we can suggest you are to use parameters to filter the data, or in case of a ReportBook - custom UI that lets the user select which reports to be shown before displaying the document.
In order to provide you more accurate suggestions, please elaborate on the scenario, the type of report you display and the role of the custom UI with check boxes.
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