Is it possible to add a custom tooltip to the ThumbnailViewer? The AnnotationViewer has a ToolTip property, but the ThumbnailViewer does not. There is an "AutoToolTip" property on the ThumbnailViewer, but this just seems to display the image index or something. I want to be able to display other details about the image (e.g. filename, tags etc) when a user hovers over it.