How can I replace the page images in the thumbnail view with a Treeview control, and have the click event of the treeview jump to a specific page?
If you mean that you want to replace the UltraPrintPreviewThumbnail control that is within the UltraPrintPreviewDialog then there is no direct means to do so. The dialog is designed to contain and conditionally show (based upon the state of the thumbnails button) - the thumbnail. You could try walking down the controls collection of the UltraPrintPreviewDialog searching for the thumb nail control. Then add your tree control to its Controls collection and set the tree's Dock to Fill so that your control completely overlays the thumbnail control containing it. With regards to going to a specific page, you would have to find the UltraPrintPreviewControl within that same dialog and programatically change its CurrentPage property.