This online demo demonstrates how to perform further customization of the exported Pdf file.
You can configure the export settings for the treelist through the RadTreeList.ExportSettings section.
Also there is na additional sub-category Pdf dedicated to various configuration settings(ItemStyle, AlternatingItemStyle, HeaderStyle and ExpandCollapseCellStyle)
for the exported .pdf document. Thus when you export RadTreeList to PDF the appearance of the Header, Item, AlternatingItem and Expand/Collapse cells in Telerik RadTreeList can be fully altered using the respective properties.