Take rendered report and write to Powerpoint?

I've got a rendered report in a ReportViewer control that I want to export into PowerPoint using Aspose.Slides. Rather than having the user click the 'Export...' button, I want to create my own button that will export the already rendered report to Powerpoint, while applying a template.

I've got the code to apply a template, but could you show me how (if possible) to get the report out of the ReportViewer control?

Thanks,

Chris