Sounds like you're talking about the IDF region feature. This feature didn't make it into the HTML5 version yet. But if you want to check it out:
1) disable HTML5: go to VisualRF setup -> toggle HTML5 enabled = no -> save
2) reload VisualRF floors tab -> you should see the floor plans come up in Flash
3) use the draw region tool, set region as 'IDF'
4) double click into IDF, add racks, switches, controllers
Note that if you want to go back to HTML5, you can, but you won't have visibility of this region that was drawn. It's worth it to file a feature request to get the IDF region feature added back into HTML5. The more votes for the feature, the more likely it will be done in a next release sooner.