I am just curious, where you required this image textbox. Can you add more
text to your message?
You can override events to draw an image, but that will mess up with the
cursor. You have to manually handle those.
There is a seach text box (www.msn.com), which has image on the corner
saying "Search the web". If you are looking that kind of text box,
guess its nothing to do with text box. Its a combination of 2 controls.
