Here is the code I'm using for the preview:

* Get a reference to the preview container API
  Do (_ReportPreview) With oPreviewContainer
  
  * Set preview container API properties
  With oPreviewContainer
    .Caption = cCaption
    .TopForm = .T.
  EndWith  

  * Create the report listener object and assign the preview container object
  oReportListener = NewObject('ReportListener','_ReportListener')
  With oReportListener
    .DynamicLineHeight = .T.
    .ListenerType = 1
    .PreviewContainer = oPreviewContainer
    .QuietMode = .T.
  EndWith

  Report Form (cReportName) OBJECT oReportListener NOWAIT

Thanks again for taking a look at this.