Hello David,
The Chicago ARTCC's website has the sector file you are looking for. At
this link, download the C90 Pro Resurrection v2.1 file. Included in that file are the necessary elements to control O'Hare. Once the file is loaded, go to View --> Diagrams. If there is anything like "Airport Graphics," you'll want to select that. Also go to View and check "Static Text" and "Geography." While I'm not entirely sure if all of the above options correspond to functions in the C90 sector file, generally most sector files do.