Originally Posted by distressed_romeo

The diminished scale doesn't have modes, as it's symetrical. For instance, A whole-half diminished (ABCDEbFF#G#) is the same as the C whole-half diminished (CDEbFF#G#AB).
All you have to do to get a mode out of a scale is treat a different degree of the scale as the tonic note, and resolve to it as strongly as possible. Diminished scales (and other symmetrical scales such as Whole-tone and Augmented scales) don't actually have a tonic as such, and so aren't really modal in nature.

Hope that makes sense.