PDF preview does not show scroll bars

During the composition of a Document Pack Template, if the PDF preview in the review pane of ComposerUI for HTML5 does not show scroll bars, and the PDF cannot be displayed in full size, ensure that the respective top-level container element has a fixed height. The top-level container element is the element identified by elementid passed to the CcmComposerUIAPIV2.Run.Start call. You can customize the element by changing the .kccmroot class.