I simply want to display an input field, that will let me capture a user, so I can filter a list from a custom object by the owner. CustomObject__c.OwnerId is not writable, so when I bind it to an input field, nothing is displayed on my page! I don't want to have a drop-down list of users (There could be hundreds!) and I don't want to create a spurious custom object with a writeable field, related to the User object. How can I get the input field functionality for a read-only field, as if it were writeable?