>"restore" restores the most recent preferred size when returning from a >"maximized" or "minimized" state.
Note that this isn't something that sheets need to be concerned with. "Restore" functionality is built into TerraFrameSkin because frames provide a restore button. However, sheets do not. In fact, there is no way for the user to maximize a sheet - it can only be done programmatically (and we might even want to prevent that by throwing in setMaximized()).
