Access various icon images to use with uicontrols

Is it possible to access the icon images of the various buttons and uicontrols found throughout matlab?

Specifically, I am writing a GUI where I include a pushbutton that calls imcontrast(). I would like to make this button look just like the contrast button in imtool(). I know I can set the CData property of the pushbutton to an image. I just don't know how I can get my hands on the image used for that contrast button in imtool(). Any ideas?

Thanks, Justin

[Justin Solomon]

In case anyone is interested. I did some digging around the imtool() file. There's a function called ipticondir(). It returns the directories of various icon images.