PDF can't be shown directly, only by URL.
So WebHTMLView has URL property.
Try to set it to URL of some PDF file available online.
PDF is embedded as iframe on a webpage.
If that looks fine, here's how to embed generated report.
1. Generate PDF and save it as WebFile (for example, in a WebPage as mPDF property)
// MAKE PDF in RAM
Dim pdfData As String = mReport.PrintToBuffer( EVReportPrintType.kToPDF, 1 )
// Prepare downloads
mPDF = New WebFile
mPDF.MimeType = "application/pdf"
mPDF.FileName = "report.pdf"
mPDF.ForceDownload = False
mPDF.Data = pdfData
2. Set WebHTMLView.URL property to point to the mPDF URL