ImgButton states

Is it possible to set up an ImgButton so that it doesn’t try to hit alternative states, such as hover? The problem is that I have an ImgButton with an image that doesn’t have a corresponding “_hover” image.

setShowRollover(false).

That works but the java doc associated with setShowRollover and setShowDown show the default value as false, which is misleading. The default values for these parameters are true.