While doing some ad hoc testing in the editor, we've noticed some places where tabbing through controls on a property page sometimes sets the dirty flag on the editor regardless of whether the value in the field has changed or not.

For example, if you select the composite to change the Target Namespace, select the TNS field and then tab off (without typing anything or changing anything), the field seems to update the model (with the same value), setting the dirty flag on the editor for no good reason.

I'm sure there are other fields in the property pages that have similar issues. We just need to go through each property page and check 'em one at a time.