This is a demo of NexTk for Linux and Win32: http://www.xmission.com/~georgeps/implementation/software/demo/NexTk_image_viewer_937.kit This demonstrates ntk_panedwindow, ntk_listbox, ntk_grid, ntk_scrollbar, ntk_button, ntk_label, and the rendering capabilities. Directions: Mouse button 1 is for panning an image. Click and drag to pan. Mouse button 2 rotates an image. Click once for a 90 degree rotation. Click twice for 180 degrees of rotation, and so on. Rotations in NexTk from [-360,360] are possible as well. Mouse button 3 scales an image. Click 3, drag until you like the size, and release. You can use the following tclkits to run it: This is a Tk-less tclkit that I've tested and used for the demo in Windows XP (Note: it tends to work better than the regular tclkit with Tk): http://www.equi4.com/pub/tk/8.5b1/tclkitsh-win32.upx.exe This is what I use for testing in Ubuntu Linux: http://www.equi4.com/pub/tk/8.5b1/tclkit-linux-x86.gz The Win32 demo has a bit of a problem on exit with cleanup_instance. I would appreciate review and advice with the Win32 paths. The Win32 code I also suspect could be made to be faster, so that it operates as smoothly as the X11/Linux version. Thanks, and I hope you like the demo app, George