[Plugin: WordPress Theme Showcase Plugin] make child themes to show a thumbnail of the child, not th

Anyway to make child themes to show a thumbnail of the child (from the child css directory) instead of showing the parent thumbnail?

All of my Genesis child themes are displaying the Genesis thumbnail. So even though there are 36 themes, more than half of them (child themes) are showing the same thumbnail, so it looks like there aren’t as many themes, and the thumbnail is not descriptive of the actual themes.

http://wordpress.org/extend/plugins/wordpress-theme-showcase-plugin/