Exporting multiple PlotModels into single pdf

Forgive me if this has been asked before but I couldn't find anything in my searches.

Is there a way to export multiple PlotModels into a single pdf file? Or perhaps export multiple pngs for these PlotModels and then combine them into a pdf?

I've currently implemented multiple pdf and png exports but they all print individually and I would like to display a single pdf on the front end.

Thank you!

P.S. OxyPlot is incredible =D

To support this, I think PlotModel.Render should be changed to accept a rectangle instead of width&height. Then create a PdfExporter.Export overload that takes a destination rectangle. The alternative can be to set a transform on the pdf rendering context, but I think it is better to change the PlotModel.Render method. I have created https://oxyplot.codeplex.com/workitem/10149