Opening Oracle Apex Links in iframe

Starting Oracle Apex 4.1, application pages by default will not open inside an iframe (inline frame).

There is a new security setting introduced, which is restricting this feature. As commented by +Patrick Wolf  in the following setting has to be changed to enable this feature:

This is what he had to say: "There is a new security feature to prevent clickJacking attacks. For new applications it's enabled, for existing ones it's disabled. Please see Shared Components > Security Attributes > Browser Security -> Embed in Frames"

Keeping this for my reference purposes only.