Forcing a regeneration of the relational model will also reset the Relational View. There is no explicit regenerate step, but many things trigger it. For example, toggling an 'IsIndependent' setting on any ObjectType, or adding a new ObjectType, settings its reference mode, then deleting it will trigger a regen. You can currently tell when we have regenerated because the Model Browser Tables node collapses.
Note that we are aware of one bug in the VS2008 tool where the longest column is clipped in the relational view. Basically, the underlying DSL framework dll's use different rendering on the two platforms, but our length calculation routines are the same in both places. This is a major display issue here and in a couple of other places in the tool (model notes, for example) and are high priority for the next release.
-Matt