I've ran into a little problem. I would like to set the selection of a category as a required property for a pagetype... Therefor it should show up among the required properties once you create a page of the pagetype I have in mind. Anyone ideas on how I could solve this?

I've been trying to create a custom property rendering checkboxes (http://shahinalborz.se/2013/04/episerver-custom-property-multiple-category-checkbox-list-from-specific-sub-category/) list but I haven't yet gotten this to work with 7.5... Thankful for help!