dynamic graphics in a tool tip?

[TedByers]

I found an interesting tip in http://wiki.netbeans.org/VwpFAQSetDifferentToolTip

It shows how to provide a unique tool tip for each row in a table using a binding to a field in the data provider.

I have a servlet that creates images, and which can use certain request parameters to create images as PNG files.  Is it possible for a tool tip to display an image from this servlet rather than the text from a field in the data provider?